
Finding alternatives to
Seiko Prospex Sea 1968 Heritage Diver's GMT Watch
Ref. spb519j1
57 watches that match on case size, movement family, and price band. Sorted by how close the match is.
Case
42mm
Movement
Automatic
Category
Diver
MSRP
$1,700
Most similar· 12
The closest match overall — same case size, similar movement family, comparable price. Often the deciding click for a new buyer.

Seiko
Prospex Sea 1968 Heritage Diver's GMT
42mm · Automatic$1,500
Shared caliber (6R54) · Same family (Prospex Sea)

Seiko
Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition
42mm · Automatic$1,750
Shared caliber (6R54) · Same family (Prospex Sea)

Seiko
Prospex Sea Seiko Diver’s Watch 60th Anniversary Limited Edition
42mm · Automatic$1,750
Shared caliber (6R54) · Same family (Prospex Sea)

Tissot
Seastar 1000
40mm · Automatic$875
Common cross-shop · Pro diver

Marathon
Anthracite Black
41mm · Automatic$2,100
Common cross-shop · Pro diver
Marathon
OD Green
41mm · Automatic$2,100
Common cross-shop · Pro diver
Marathon
OD Green
41mm · Automatic$1,650
Common cross-shop · Pro diver

DOXA
SUB 300
42.5mm · Automatic$2,890
Common cross-shop · Pro diver

Tissot
Seastar Wilson WNBA
40mm · Automatic$875
Common cross-shop · Pro diver

Longines
LEGEND DIVER 42
42mm · Automatic$2,850
Pro diver · Automatic

Longines
LEGEND DIVER 42 BLACK LACQUERED
42mm · Automatic$3,200
Pro diver · Automatic

Longines
HYDROCONQUEST GMT
43mm · Automatic$3,350
Pro diver · Automatic
Cheaper alternatives· 12
If the price is the only thing keeping you off this watch, these get you most of the way there for less.

Seiko
Monster
42.4mm · Automatic$550
Same family (Prospex Sea) · Pro diver

Seiko
Prospex Sea
43.8mm · Automatic$625
Same family (Prospex Sea) · Pro diver

Seiko
King Turtle
45mm · Automatic$650
Same family (Prospex Sea) · Pro diver

Citizen
Promaster Diver Automatic
44mm · Automatic$469
Common cross-shop · Pro diver

Orient
AA08 Diver Watch
41.8mm · Automatic$390
Common cross-shop · Automatic

Orient
Kamasu
41.8mm · Automatic$375
Common cross-shop · Automatic

Orient
Mako-3 AA08 Diver Watch
41.8mm · Automatic$375
Common cross-shop · Automatic

Tissot
PR516
38mm · Automatic$825
Common cross-shop · Automatic

Citizen
Tsuyosa Shore
40mm · Automatic$495
Common cross-shop · Automatic

Hamilton
Khaki Field King Auto
40mm · Automatic$845
Common cross-shop · Automatic

Hamilton
Khaki Field King Day-Date
40mm · Automatic$845
Common cross-shop · Automatic

Marathon
Black
41mm · Automatic$600
Common cross-shop · Automatic
Pricier alternatives· 12
Where the same idea goes when budget isn't the constraint — luxury upgrades and step-ups.

Seiko
Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch
42.6mm · Automatic$3,600
Pro diver · Automatic

DOXA
SUB 300 Carbon
42.5mm · Automatic$4,390
Common cross-shop · Pro diver

Longines
LEGEND DIVER BRONZE
42mm · Automatic$3,550
Pro diver · Automatic

Seiko
Prospex Marinemaster Marinemaster 1968 Heritage JAMSTEC Limited Edition
42.6mm · Automatic$3,900
Pro diver · Automatic

Longines
LEGEND DIVER 59
42mm · Automatic$4,100
Pro diver · Automatic

Bremont
Blue / Green 40mm
40mm · Automatic$3,900
Pro diver · Automatic

NOMOS Glashütte
Club Sport neomatik 42 date black
42mm · Automatic$5,050
Pro diver · Automatic

NOMOS Glashütte
Tangente Sport neomatik 42 date marine black
42mm · Automatic$6,030
Pro diver · Automatic

Sinn
T50 GBDR
41mm · Automatic$4,428
Pro diver · Automatic

Sinn
T50 GOLDBRONZE B
41mm · Automatic$5,378
Pro diver · Automatic

Bremont
Black 43mm
43mm · Automatic$5,100
Pro diver · Automatic

Bremont
Black 43mm
43mm · Automatic$4,700
Pro diver · Automatic
Looks like this· 9
Watches that wear the same design language — close enough that a stranger might confuse them across the room.

Pagani Design
PD-1719
42.5mm · Automatic$154
Common cross-shop · Pro diver

Pagani Design
PD-1685
42mm · Automatic$171
Common cross-shop · Tool diver

Pagani Design
PD-1702
42mm · Automatic$132
Common cross-shop · Tool diver

Sugess
Seestern DOX V3
42mm · Automatic$199
Pro diver · Automatic

Sugess
Seestern Vintage S407 600T
39mm · Automatic$249
Pro diver · Automatic

Sugess
Ocean Star S421
40mm · Automatic$449
Pro diver · Automatic

Seestern
Sub 300 V4
42mm · Automatic$10
Automatic · Same size

Seestern
S456 GMT
41mm · Automatic GMT$299
Same size · Sapphire

Seestern
S450 Ocean Star
40mm · Automatic$299
Automatic · Similar size
Microbrand picks· 12
Independent makers covering the same brief — usually with something the mainstream brands don't.

Borealis Watch Co.
Estoril 300 GMT
41.50mm · Automatic$600
Common cross-shop · Pro diver

Baltic
Aquascaphe Titanium
41mm · Automatic$788
Common cross-shop · Pro diver

Borealis Watch Co.
Caloura 300m
42mm · Automatic$275
Common cross-shop · Pro diver

Borealis Watch Co.
Jamanta
42.50mm · Automatic$415
Common cross-shop · Pro diver

Boldr
Odyssey Freediver
40mm · Automatic$649
Common cross-shop · Pro diver

CWC
1980 RN Divers Automatic Re-Issue Watch
41mm · Automatic$2,458
Common cross-shop · Pro diver

CWC
Arctic Radar Automatic Diver Watch
41mm · Automatic$1,333
Common cross-shop · Pro diver

CWC
Automatic Divers Watch Mk.2 Black
41mm · Automatic$1,249
Common cross-shop · Pro diver

Geckota
Satin Reef Green
42mm · Automatic$349
Common cross-shop · Pro diver

Spinnaker
Blue Yonder
44mm · Automatic$239
Common cross-shop · Pro diver

Astor + Banks
Tobacco
40mm · Automatic$1,149
Common cross-shop · Pro diver

Boldr
Odyssey 40mm
40mm · Automatic$799
Common cross-shop · Pro diver