Finding alternatives to
Seiko Prospex Sea
Ref. spb317j1
54 watches that match on case size, movement family, and price band. Sorted by how close the match is.
Case
41mm
Movement
Automatic
Category
Diver
MSRP
$900
Microbrand picks· 12
Independent makers covering the same brief — usually with something the mainstream brands don't.
CWC
E9 Automatic Diver Watch
41mm · Automatic$1,391
Common cross-shop · Pro diver
Borealis Watch Co.
Estoril 300 GMT
41.50mm · Automatic$600
Common cross-shop · Pro diver
Zelos
Diver - Flare
40mm · Automatic$529
Common cross-shop · Pro diver
Astor + Banks
Tobacco
40mm · Automatic$1,149
Common cross-shop · Pro diver
Baltic
Aquascaphe Titanium
41mm · Automatic$788
Common cross-shop · Pro diver
Boldr
Odyssey 40mm
40mm · Automatic$799
Common cross-shop · Pro diver
Christopher Ward
C60 Pro 300
42mm · Automatic$1,550
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
Phoibos
Depth Hunter Dlc
40mm · Automatic$500
Pro diver · Automatic
Christopher Ward
C60 Atoll 300
40mm · Automatic$1,320
Common cross-shop · Pro diver
Most similar· 12
The closest match overall — same case size, similar movement family, comparable price. Often the deciding click for a new buyer.
Seiko
62MAS
40.5mm · Automatic$1,200
Shared caliber (6R35) · Same family (Prospex Sea)
Seiko
Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition
40.5mm · Automatic$1,250
Shared caliber (6R35) · Same family (Prospex Sea)
Seiko
Prospex Sea 1965 Heritage Diver's Watch
40mm · Automatic$1,300
Related caliber family · Same family (Prospex Sea)
Marathon
Black on Rubber Strap
41mm · Automatic$1,800
Common cross-shop · Pro diver
Marathon
OD Green
41mm · Automatic$1,650
Common cross-shop · Pro diver
Tissot
Seastar 1000
40mm · Automatic$875
Common cross-shop · Pro diver
Tissot
Seastar Wilson WNBA
40mm · Automatic$875
Common cross-shop · Pro diver
Marathon
Arctic White on Rubber Strap
41mm · Automatic$1,800
Common cross-shop · Pro diver
Citizen
Promaster Fujitsubo
41mm · Automatic$1,195
Common cross-shop · Pro diver
DOXA
SUB 600T
40mm · $1,650
Common cross-shop · Pro diver
Glycine
Combat Sub Sport Bronze
39mm · Automatic$1,650
Common cross-shop · Pro diver
Nivada Grenchen
Depthmaster
39mm · Automatic$1,050
Pro diver · Automatic
Cheaper alternatives· 9
If the price is the only thing keeping you off this watch, these get you most of the way there for less.
Orient
AC0Q-40 Diver Watch
39.9mm · Automatic$370
Common cross-shop · Automatic
Orient
AA08 Diver Watch
41.8mm · Automatic$390
Common cross-shop · Automatic
Orient
Kamasu
41.8mm · Automatic$375
Common cross-shop · Automatic
Seiko
DressKX
40mm · Automatic$315
Automatic · Same size
Seiko
5 Sports SKX series
38mm · Automatic$350
Automatic · Visually near-identical
Citizen
Tsuyosa 60
40mm · Automatic$431
Common cross-shop · Automatic
Citizen
Tsuyosa Automatic
40mm · Automatic$356
Common cross-shop · Automatic
Seiko
5 Sports Field series
39.4mm · Automatic$315
Automatic · Similar size
Citizen
Tsuyosa Disney
40mm · Automatic$371
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 Sea 1970 Heritage Diver's Black Series Limited Edition
44mm · Automatic$3,300
Same family (Prospex Sea) · 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
Longines
LEGEND DIVER 42
42mm · Automatic$2,850
Pro diver · Automatic
Longines
LEGEND DIVER 42 BLACK LACQUERED
42mm · Automatic$3,200
Pro diver · Automatic
Bremont
Blue / Green 40mm
40mm · Automatic$3,900
Pro diver · Automatic
DOXA
SUB 300
42.5mm · Automatic$2,890
Common cross-shop · Pro diver
Longines
HYDROCONQUEST MESH
41mm · Automatic$2,350
Pro diver · Automatic
Seiko
Prospex Marinemaster Marinemaster 1965 Diver’s Modern Re-interpretation
39.5mm · Automatic$2,800
Pro diver · Automatic
Seiko
Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch
39.5mm · Automatic$2,800
Pro diver · Automatic
DOXA
SUB 300 Carbon
42.5mm · Automatic$4,390
Common cross-shop · Pro diver
Glycine
Combat Sub Sport
39mm · Automatic$1,850
Common cross-shop · Pro diver
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-1692
40mm · Automatic$137
Common cross-shop · Tool diver
Pagani Design
PD-1692 II
40mm · Automatic$125
Common cross-shop · Tool diver
Pagani Design
PD-1692 II AK
40mm · Automatic$125
Common cross-shop · Tool diver
Sugess
Seestern S462 Titanium GMT Pro Diver LE
40mm · Automatic GMT$449
Pro diver · Same size
Sugess
Ocean Star S450 YM
40mm · Automatic$449
Pro diver · Automatic
Sugess
Seestern DOX V3
42mm · Automatic$199
Pro diver · Automatic
Seestern
Sub 300 V4
42mm · Automatic$10
Automatic · Same size
Seestern
S456 GMT
41mm · Automatic GMT$299
Same size · Sapphire
Seestern
S443 Column Wheel Chronograph
40mm · Manual winding chronograph$10
Same size · Sapphire