Seiko Prospex Sea The Black Series
Finding alternatives to

Seiko Prospex Sea The Black Series

Ref. srpk43

128 watches that match on case size, movement family, and price band. Sorted by how close the match is.

Case
45mm
Movement
Automatic
Category
Diver
MSRP
$765
Microbrand picks· 82

Independent makers covering the same brief — usually with something the mainstream brands don't.

Fortis Amber Orange — alternative to Seiko Prospex Sea The Black Series
Fortis
Amber Orange
44mm · Automatic$5,120
Pro diver · Automatic
Fortis Black Resin — alternative to Seiko Prospex Sea The Black Series
Fortis
Black Resin
44mm · Automatic$5,450
Pro diver · Automatic
Phoibos Leviathan — alternative to Seiko Prospex Sea The Black Series
Phoibos
Leviathan
45mm · Automatic$309
Pro diver · Automatic
Islander Islander Automatic Turtle Dive Watch with Blue Dial #ISL-301 — alternative to Seiko Prospex Sea The Black Series
Islander
Islander Automatic Turtle Dive Watch with Blue Dial #ISL-301
45mm · Automatic$399
Pro diver · Automatic
Spinnaker Blue Yonder — alternative to Seiko Prospex Sea The Black Series
Spinnaker
Blue Yonder
44mm · Automatic$239
Pro diver · Automatic
Zelos Hammered Grey — alternative to Seiko Prospex Sea The Black Series
Zelos
Hammered Grey
44mm · Automatic$549
Pro diver · Automatic
Phoibos Wave Master — alternative to Seiko Prospex Sea The Black Series
Phoibos
Wave Master
42mm · Automatic$309
Pro diver · Automatic
HELM Khuraburi — alternative to Seiko Prospex Sea The Black Series
HELM
Khuraburi
42mm · Automatic$310
Pro diver · Automatic
Zelos Ti - Red Tiger's Eye — alternative to Seiko Prospex Sea The Black Series
Zelos
Ti - Red Tiger's Eye
44mm · Automatic$899
Pro diver · Automatic
Zelos Ti - Red Tiger's Eye — alternative to Seiko Prospex Sea The Black Series
Zelos
Ti - Red Tiger's Eye
44mm · Automatic$559
Pro diver · Automatic
Borealis Watch Co. Caloura 300m — alternative to Seiko Prospex Sea The Black Series
Borealis Watch Co.
Caloura 300m
42mm · Automatic$275
Pro diver · Automatic
Borealis Watch Co. Jamanta — alternative to Seiko Prospex Sea The Black Series
Borealis Watch Co.
Jamanta
42.50mm · Automatic$415
Pro diver · Automatic
HELM Vanuatu — alternative to Seiko Prospex Sea The Black Series
HELM
Vanuatu
42mm · Automatic$285
Pro diver · Automatic
Spinnaker Dark Cerulean — alternative to Seiko Prospex Sea The Black Series
Spinnaker
Dark Cerulean
45mm · Automatic$289
Pro diver · Automatic
Spinnaker Dark Cerulean — alternative to Seiko Prospex Sea The Black Series
Spinnaker
Dark Cerulean
45mm · Automatic$289
Pro diver · Automatic
Formex Reef 42 mm — alternative to Seiko Prospex Sea The Black Series
Formex
Reef 42 mm
42mm · Automatic$2,414
Pro diver · Automatic
HELM Khuraburi Titanium — alternative to Seiko Prospex Sea The Black Series
HELM
Khuraburi Titanium
42mm · Automatic$375
Pro diver · Automatic
Marloe Watch Company Morar 310 — alternative to Seiko Prospex Sea The Black Series
Marloe Watch Company
Morar 310
42mm · Automatic$697
Pro diver · Automatic
Phoibos Great Wall — alternative to Seiko Prospex Sea The Black Series
Phoibos
Great Wall
42mm · Automatic$465
Pro diver · Automatic
Baltic Aquascaphe Titanium — alternative to Seiko Prospex Sea The Black Series
Baltic
Aquascaphe Titanium
41mm · Automatic$788
Pro diver · Automatic
Borealis Watch Co. Estoril 300 GMT — alternative to Seiko Prospex Sea The Black Series
Borealis Watch Co.
Estoril 300 GMT
41.50mm · Automatic$600
Pro diver · Automatic
Geckota Satin Reef Green — alternative to Seiko Prospex Sea The Black Series
Geckota
Satin Reef Green
42mm · Automatic$349
Pro diver · Automatic
Marloe Watch Company Sceptre — alternative to Seiko Prospex Sea The Black Series
Marloe Watch Company
Sceptre
42mm · Automatic$507
Tool diver · Automatic
Marloe Watch Company Sceptre S2 — alternative to Seiko Prospex Sea The Black Series
Marloe Watch Company
Sceptre S2
42mm · Automatic$507
Tool diver · Automatic
Venezianico Nereide Bronzo — alternative to Seiko Prospex Sea The Black Series
Venezianico
Nereide Bronzo
42mm · Automatic$1,250
Pro diver · Automatic
Venezianico Nereide Titanio — alternative to Seiko Prospex Sea The Black Series
Venezianico
Nereide Titanio
42mm · Automatic$1,250
Pro diver · Automatic
Ikepod Seapod Bronze Archi — alternative to Seiko Prospex Sea The Black Series
Ikepod
Seapod Bronze Archi
46mm · Automatic$2,808
Tool diver · Automatic
Ikepod Seapod S001 — alternative to Seiko Prospex Sea The Black Series
Ikepod
Seapod S001
46mm · Automatic$1,458
Tool diver · Automatic
Ikepod Seapod S007 — alternative to Seiko Prospex Sea The Black Series
Ikepod
Seapod S007
46mm · Automatic$1,458
Tool diver · Automatic
Islander Islander Automatic Dive Watch with Bracelet, Double-Domed AR Sapphire Crystal, and Embossed Ceramic Bezel Insert #ISL-18 — alternative to Seiko Prospex Sea The Black Series
Islander
Islander Automatic Dive Watch with Bracelet, Double-Domed AR Sapphire Crystal, and Embossed Ceramic Bezel Insert #ISL-18
43mm · Automatic$429
Tool diver · Automatic
Islander Islander Black Dial Automatic Dive Watch with DLC Case and Bracelet, AR Sapphire Crystal, and Luminous Ceramic Bezel Insert #ISL-34 — alternative to Seiko Prospex Sea The Black Series
Islander
Islander Black Dial Automatic Dive Watch with DLC Case and Bracelet, AR Sapphire Crystal, and Luminous Ceramic Bezel Insert #ISL-34
43mm · Automatic$469
Tool diver · Automatic
Yema Steel — alternative to Seiko Prospex Sea The Black Series
Yema
Steel
43mm · Automatic$13,000
Pro diver · Automatic
Sternglas Marus — alternative to Seiko Prospex Sea The Black Series
Sternglas
Marus
42mm · Automatic$485
Tool diver · Automatic
CWC 1980 RN Divers Automatic Re-Issue Watch — alternative to Seiko Prospex Sea The Black Series
CWC
1980 RN Divers Automatic Re-Issue Watch
41mm · Automatic$2,458
Pro diver · Automatic
CWC Arctic Radar Automatic Diver Watch — alternative to Seiko Prospex Sea The Black Series
CWC
Arctic Radar Automatic Diver Watch
41mm · Automatic$1,333
Pro diver · Automatic
CWC Automatic Divers Watch Mk.2 Black — alternative to Seiko Prospex Sea The Black Series
CWC
Automatic Divers Watch Mk.2 Black
41mm · Automatic$1,249
Pro diver · Automatic
Yema Titanium — alternative to Seiko Prospex Sea The Black Series
Yema
Titanium
43mm · Automatic$13,000
Pro diver · Automatic
Fortis Amber Orange — alternative to Seiko Prospex Sea The Black Series
Fortis
Amber Orange
40mm · Automatic$3,520
Pro diver · Automatic
Praesidus Patina — alternative to Seiko Prospex Sea The Black Series
Praesidus
Patina
44mm · Automatic$550
Tool diver · Automatic
Sternglas Marus 2.0 — alternative to Seiko Prospex Sea The Black Series
Sternglas
Marus 2.0
41mm · Automatic$593
Tool diver · Automatic
Sternglas Merion — alternative to Seiko Prospex Sea The Black Series
Sternglas
Merion
41mm · Automatic$701
Tool diver · Automatic
Venezianico Nereide Ametista — alternative to Seiko Prospex Sea The Black Series
Venezianico
Nereide Ametista
42mm · Automatic$1,250
Tool diver · Automatic
Formex Reef 39.5 mm — alternative to Seiko Prospex Sea The Black Series
Formex
Reef 39.5 mm
39.5mm · Automatic$2,230
Pro diver · Automatic
Astor + Banks Tobacco — alternative to Seiko Prospex Sea The Black Series
Astor + Banks
Tobacco
40mm · Automatic$1,149
Pro diver · Automatic
Nodus Sector Deep — alternative to Seiko Prospex Sea The Black Series
Nodus
Sector Deep
38mm · Automatic$650
Pro diver · Automatic
Nodus Sector Deep - DLC Destro — alternative to Seiko Prospex Sea The Black Series
Nodus
Sector Deep - DLC Destro
38mm · Automatic$700
Pro diver · Automatic
Nodus Sector Deep Pioneer — alternative to Seiko Prospex Sea The Black Series
Nodus
Sector Deep Pioneer
38mm · Automatic$675
Pro diver · Automatic
Baltic Aquascaphe Classic — alternative to Seiko Prospex Sea The Black Series
Baltic
Aquascaphe Classic
39mm · Automatic$648
Tool diver · Automatic
Lum-Tec Date — alternative to Seiko Prospex Sea The Black Series
Lum-Tec
Date
44mm · Automatic$999
Tool diver · Automatic
Lum-Tec Marine 9 — alternative to Seiko Prospex Sea The Black Series
Lum-Tec
Marine 9
39mm · Automatic$463
Pro diver · Automatic
Monta Blue / Aluminum — alternative to Seiko Prospex Sea The Black Series
Monta
Blue / Aluminum
40mm · Automatic$2,550
Pro diver · Automatic
Yema Steel Limited Edition — alternative to Seiko Prospex Sea The Black Series
Yema
Steel Limited Edition
47mm · Automatic$2,117
Tool diver · Automatic
Baltic Aquascaphe Bronze — alternative to Seiko Prospex Sea The Black Series
Baltic
Aquascaphe Bronze
39mm · Automatic$697
Tool diver · Automatic
Dryden Steel 12 Hour 41mm — alternative to Seiko Prospex Sea The Black Series
Dryden
Steel 12 Hour 41mm
41mm · Automatic$650
Tool diver · Automatic
Oblvlo DM Skeleton Dive — alternative to Seiko Prospex Sea The Black Series
Oblvlo
DM Skeleton Dive
40mm · Automatic$194
Tool diver · Automatic
Geckota Amber Bezel — alternative to Seiko Prospex Sea The Black Series
Geckota
Amber Bezel
40mm · Automatic$349
Tool diver · Automatic
Henry Archer Yacht Blue — alternative to Seiko Prospex Sea The Black Series
Henry Archer
Yacht Blue
42mm · Automatic$3,299
Tool diver · Automatic
KUOE SOMBRERO 90-011 — alternative to Seiko Prospex Sea The Black Series
KUOE
SOMBRERO 90-011
38mm · Automatic$980
Tool diver · Automatic
Vaer Black — alternative to Seiko Prospex Sea The Black Series
Vaer
Black
39mm · Automatic$679
Tool diver · Automatic
Vaer Standard — alternative to Seiko Prospex Sea The Black Series
Vaer
Standard
39mm · Automatic$699
Tool diver · Automatic
Dan Henry Orange — alternative to Seiko Prospex Sea The Black Series
Dan Henry
Orange
40mm · Automatic$310
Tool diver · Automatic
Galo Super200 — alternative to Seiko Prospex Sea The Black Series
Galo
Super200
39mm · Automatic$488
Tool diver · Automatic
Galo Super200 Dark Edition — alternative to Seiko Prospex Sea The Black Series
Galo
Super200 Dark Edition
39mm · Automatic$488
Tool diver · Automatic
Hemel Gallant USAF Edition — alternative to Seiko Prospex Sea The Black Series
Hemel
Gallant USAF Edition
40mm · Automatic$300
Tool diver · Automatic
Henry Archer Moon Grey 40mm — alternative to Seiko Prospex Sea The Black Series
Henry Archer
Moon Grey 40mm
40mm · Automatic$4,299
Tool diver · Automatic
Henry Archer Sylva — alternative to Seiko Prospex Sea The Black Series
Henry Archer
Sylva
40mm · Automatic$4,999
Tool diver · Automatic
Lorier Standard — alternative to Seiko Prospex Sea The Black Series
Lorier
Standard
39mm · Automatic$699
Tool diver · Automatic
Lorier Standard — alternative to Seiko Prospex Sea The Black Series
Lorier
Standard
39mm · Automatic$699
Tool diver · Automatic
Lorier Skyward — alternative to Seiko Prospex Sea The Black Series
Lorier
Skyward
39mm · Automatic$599
Tool diver · Automatic
Monta Black — alternative to Seiko Prospex Sea The Black Series
Monta
Black
40mm · Automatic$1,850
Tool diver · Automatic
Vaer Anacapa — alternative to Seiko Prospex Sea The Black Series
Vaer
Anacapa
39mm · Automatic$699
Tool diver · Automatic
Wolbrook Black "Tropic" Rubber Strap 40mm — alternative to Seiko Prospex Sea The Black Series
Wolbrook
Black "Tropic" Rubber Strap 40mm
40mm · Automatic$579
Tool diver · Automatic
Wolbrook Black "Tropic" Rubber Strap — alternative to Seiko Prospex Sea The Black Series
Wolbrook
Black "Tropic" Rubber Strap
40mm · Automatic$539
Tool diver · Automatic
Helgray Poseidon Diver (Automatic) — alternative to Seiko Prospex Sea The Black Series
Helgray
Poseidon Diver (Automatic)
40mm · $249
Pro diver · Sapphire
Maen SHW.01 — alternative to Seiko Prospex Sea The Black Series
Maen
SHW.01
38mm · Automatic$503
Pro diver · Automatic
Maen M1.1.5 — alternative to Seiko Prospex Sea The Black Series
Maen
M1.1.5
38mm · Automatic$719
Pro diver · Automatic
Farer AQUA COMPRESSOR TITANIUM SERIES III — alternative to Seiko Prospex Sea The Black Series
Farer
AQUA COMPRESSOR TITANIUM SERIES III
41.5mm · $1,350
Pro diver · Diver-grade WR
Halios Sunburst Blue — alternative to Seiko Prospex Sea The Black Series
Halios
Sunburst Blue
40mm · Automatic$765
Tool diver · Automatic
Geckota Ice White — alternative to Seiko Prospex Sea The Black Series
Geckota
Ice White
38.5mm · Automatic$375
Tool diver · Automatic
Cincinnati Watch Company Desk Diver Professional Dive Watch Black & Orange — alternative to Seiko Prospex Sea The Black Series
Cincinnati Watch Company
Desk Diver Professional Dive Watch Black & Orange
38mm · Manual$750
Tool diver · Sapphire
Praesidus Blue Tropic Rubber 38mm — alternative to Seiko Prospex Sea The Black Series
Praesidus
Blue Tropic Rubber 38mm
38mm · Automatic$645
Tool diver · Automatic
Wolbrook Black "Topic" Rubber Strap — alternative to Seiko Prospex Sea The Black Series
Wolbrook
Black "Topic" Rubber Strap
38mm · Automatic$549
Tool diver · Automatic
Steps up from here· 23

Where the same idea goes when budget isn't the constraint.

Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition — alternative to Seiko Prospex Sea The Black Series
Seiko
Prospex Sea 1970 Heritage Diver's Black Series Limited Edition
44mm · Automatic$3,300
Same family (Prospex Sea) · Pro diver
Seiko Prospex Sea 1968 Heritage Diver's GMT Watch — alternative to Seiko Prospex Sea The Black Series
Seiko
Prospex Sea 1968 Heritage Diver's GMT Watch
42mm · Automatic$1,700
Same family (Prospex Sea) · Pro diver
Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition — alternative to Seiko Prospex Sea The Black Series
Seiko
Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition
42mm · Automatic$1,750
Same family (Prospex Sea) · Pro diver
Marathon Arctic White on Rubber Strap — alternative to Seiko Prospex Sea The Black Series
Marathon
Arctic White on Rubber Strap
46mm · Automatic$2,500
Pro diver · Automatic
Marathon Black on Rubber Strap — alternative to Seiko Prospex Sea The Black Series
Marathon
Black on Rubber Strap
46mm · Automatic$2,500
Pro diver · Automatic
Bremont Black 43mm — alternative to Seiko Prospex Sea The Black Series
Bremont
Black 43mm
43mm · Automatic$4,700
Pro diver · Automatic
Marathon Anthracite Black on Rubber Strap — alternative to Seiko Prospex Sea The Black Series
Marathon
Anthracite Black on Rubber Strap
46mm · Automatic$3,250
Pro diver · Automatic
DOXA SUB 300 — alternative to Seiko Prospex Sea The Black Series
DOXA
SUB 300
42.5mm · Automatic$2,890
Pro diver · Automatic
Bremont Black 43mm — alternative to Seiko Prospex Sea The Black Series
Bremont
Black 43mm
43mm · Automatic$5,100
Pro diver · Automatic
DOXA SUB 750T — alternative to Seiko Prospex Sea The Black Series
DOXA
SUB 750T
47mm · Automatic$2,790
Pro diver · Automatic
Longines LEGEND DIVER 59 — alternative to Seiko Prospex Sea The Black Series
Longines
LEGEND DIVER 59
42mm · Automatic$4,100
Pro diver · Automatic
DOXA SUB 300 Carbon — alternative to Seiko Prospex Sea The Black Series
DOXA
SUB 300 Carbon
42.5mm · Automatic$4,390
Pro diver · Automatic
Grand Seiko SBGJ237 — alternative to Seiko Prospex Sea The Black Series
Grand Seiko
SBGJ237
44.2mm · Automatic$7,600
Tool diver · Automatic
Grand Seiko SBGH289 — alternative to Seiko Prospex Sea The Black Series
Grand Seiko
SBGH289
43.8mm · Automatic$7,700
Tool diver · Automatic
Hamilton Khaki Navy Frogman Titanium Auto — alternative to Seiko Prospex Sea The Black Series
Hamilton
Khaki Navy Frogman Titanium Auto
46mm · Automatic$1,675
Common cross-shop · Automatic
Bremont Blue / Green 40mm — alternative to Seiko Prospex Sea The Black Series
Bremont
Blue / Green 40mm
40mm · Automatic$3,900
Pro diver · Automatic
Grand Seiko SBGE277 — alternative to Seiko Prospex Sea The Black Series
Grand Seiko
SBGE277
44mm · Spring Drive$6,800
Tool diver · Same size
Hamilton Khaki Navy BeLOWZERO Auto Titanium — alternative to Seiko Prospex Sea The Black Series
Hamilton
Khaki Navy BeLOWZERO Auto Titanium
46mm · Automatic$2,175
Common cross-shop · Automatic
Longines LEGEND DIVER — alternative to Seiko Prospex Sea The Black Series
Longines
LEGEND DIVER
39mm · Automatic$3,850
Pro diver · Automatic
Tissot T-Race MotoGP 2026 — alternative to Seiko Prospex Sea The Black Series
Tissot
T-Race MotoGP 2026
45mm · Automatic$2,375
Common cross-shop · Automatic
Hamilton Khaki Navy Scuba Automatic GMT 43mm Bronze — alternative to Seiko Prospex Sea The Black Series
Hamilton
Khaki Navy Scuba Automatic GMT 43mm Bronze
43mm · Automatic$1,675
Common cross-shop · Automatic
Tissot Pinarello — alternative to Seiko Prospex Sea The Black Series
Tissot
Pinarello
43.14mm · Automatic$1,775
Common cross-shop · Automatic
Tissot PR516 — alternative to Seiko Prospex Sea The Black Series
Tissot
PR516
41mm · Automatic$2,150
Common cross-shop · Automatic
In the same price band· 16

Comparable watches at roughly the same money. Often the deciding click for a new buyer.

Cheaper alternatives· 4

If the price is the only thing keeping you off this watch, these get you most of the way there for less.

Direct homages· 3

Watches that wear the same design language — close enough that a stranger might confuse them across the room.