Finding alternatives to
Seiko Prospex Sea
Ref. spb349j1
55 watches that match on case size, movement family, and price band. Sorted by how close the match is.
Case
43.5mm
Movement
Automatic
Category
Diver
MSRP
$1,500
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 1970 Heritage Diver's Save the Ocean Special Edition
42.7mm · Automatic$1,350
Shared caliber (6R35) · Same family (Prospex Sea)
Seiko
Prospex Sea PADI Special Edition
45mm · Automatic$1,200
Shared caliber (6R35) · Same family (Prospex Sea)
DOXA
SUB 300
42.5mm · Automatic$2,890
Common cross-shop · Pro diver
Tissot
Seastar 1000 Powermatic 80 GMT
46mm · Automatic$1,375
Common cross-shop · Pro diver
Tissot
Seastar 2000
46mm · Automatic$1,275
Common cross-shop · Pro diver
Tissot
Seastar 1000
40mm · Automatic$875
Common cross-shop · Pro diver
Marathon
Arctic White on Rubber Strap
41mm · Automatic$1,800
Common cross-shop · Pro diver
Marathon
Arctic White on Rubber Strap
46mm · Automatic$2,500
Common cross-shop · Pro diver
Marathon
Anthracite Black
41mm · Automatic$2,100
Common cross-shop · Pro diver
Citizen
Promaster Fujitsubo
41mm · Automatic$1,195
Common cross-shop · Pro diver
DOXA
DOXA Army
42.5mm · $2,490
Common cross-shop · Pro diver
Cheaper alternatives· 10
If the price is the only thing keeping you off this watch, these get you most of the way there for less.
Seiko
Prospex Sea PADI Special Edition
43.8mm · Automatic$625
Same family (Prospex Sea) · Pro diver
Seiko
Prospex Sea Save the Ocean Special Edition
43.8mm · Automatic$650
Same family (Prospex Sea) · Pro diver
Seiko
Prospex Sea PADI Special Edition
41.7mm · Automatic$650
Same family (Prospex Sea) · Pro diver
Citizen
Promaster Diver Automatic
44mm · Automatic$469
Common cross-shop · Pro diver
Orient
RA-AC0K Diver Watch
43.4mm · Automatic$455
Common cross-shop · Automatic
Orient
RA-AC0K05G00B LE
43.4mm · Automatic$450
Common cross-shop · Automatic
Orient
AA08 Diver Watch
41.8mm · Automatic$390
Common cross-shop · Automatic
Citizen
Tsuyosa Shore
40mm · Automatic$495
Common cross-shop · Automatic
Citizen
Tsuyosa 60
40mm · Automatic$431
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 Sea 1970 Heritage Diver's Black Series Limited Edition
44mm · Automatic$3,300
Same family (Prospex Sea) · Pro diver
Longines
HYDROCONQUEST GMT
43mm · Automatic$3,350
Pro diver · Automatic
Longines
ULTRA‑CHRON CARBON
43mm · Automatic$5,550
Pro diver · Automatic
Seiko
Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch
42.6mm · Automatic$3,600
Pro diver · Automatic
Seiko
Prospex Marinemaster Seiko Diver’s Watch 60th Anniversary Limited Edition
45.4mm · Automatic$4,600
Pro diver · Automatic
DOXA
SUB 300 Carbon
42.5mm · Automatic$4,390
Common cross-shop · Pro diver
Tudor
Pelagos
40mm · Automatic$6,025
Pro diver · Automatic
Tudor
Pelagos LHD
40mm · Automatic$6,025
Pro diver · Automatic
Bremont
Black 43mm
43mm · Automatic$4,700
Pro diver · Automatic
Longines
LEGEND DIVER 42 BLACK LACQUERED
42mm · Automatic$3,200
Pro diver · Automatic
Tudor
Black Bay 68
43mm · Automatic$5,475
Tool diver · Automatic
Bremont
Black 43mm
43mm · Automatic$5,100
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-1680
44mm · Automatic$171
Common cross-shop · Tool diver
Pagani Design
PD-1695
45mm · Automatic$145
Common cross-shop · Pro diver
Sugess
Seestern DOX V3
42mm · Automatic$199
Pro diver · Automatic
Sugess
Ocean Star S421
40mm · Automatic$449
Pro diver · Automatic
Sugess
Seestern S462 Titanium GMT Pro Diver LE
40mm · Automatic GMT$449
Pro diver · Sapphire
Seestern
Sub 300 V4
42mm · Automatic$10
Automatic · Similar size
Seestern
S456 GMT
41mm · Automatic GMT$299
Sapphire · Diver-grade WR
Seestern
S450 Ocean Star
40mm · Automatic$299
Automatic · Sapphire
Microbrand picks· 12
Independent makers covering the same brief — usually with something the mainstream brands don't.
Borealis Watch Co.
Caloura 300m
42mm · Automatic$275
Common cross-shop · Pro diver
Zelos
Ti - Red Tiger's Eye
44mm · Automatic$899
Common cross-shop · Pro diver
Zelos
DLC - Blue Meteorite
43mm · Automatic$599
Common cross-shop · Pro diver
Zelos
Ti - Red Tiger's Eye
44mm · Automatic$1,499
Common cross-shop · Pro diver
Borealis Watch Co.
Jamanta
42.50mm · Automatic$415
Common cross-shop · Pro diver
Phoibos
Apollo Titanium
41mm · Automatic$575
Pro diver · Automatic
Baltic
Aquascaphe Titanium
41mm · Automatic$788
Common cross-shop · Pro diver
Yema
Titanium
43mm · Automatic$13,000
Common cross-shop · Pro diver
Borealis Watch Co.
Estoril 300 GMT
41.50mm · Automatic$600
Common cross-shop · Pro diver
Spinnaker
Blue Yonder
44mm · Automatic$239
Common cross-shop · Pro diver
Spinnaker
TIGER EYE
42mm · Automatic$520
Common cross-shop · Pro diver
Spinnaker
Forest Green
43mm · Automatic$850
Common cross-shop · Pro diver