Seiko Prospex Sea Seiko Prospex 1965 Heritage Diver’s Watch Save the Ocean Limited Edition
Finding alternatives to

Seiko Prospex Sea Seiko Prospex 1965 Heritage Diver’s Watch Save the Ocean Limited Edition

Ref. spb545j1

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

Case
40mm
Movement
Automatic
Category
Diver
MSRP
$1,400
The short answer

The closest alternative to the Seiko Prospex Sea Seiko Prospex 1965 Heritage Diver’s Watch Save the Ocean Limited Edition is the Seiko Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition ($1,550) — shared caliber (6R55) and Same family (Prospex Sea). If price is the constraint, the Orient Mako-3 AA08 Diver Watch at $375 (vs $1,400 for the Prospex Sea Seiko Prospex 1965 Heritage Diver’s Watch Save the Ocean Limited Edition) covers most of the same brief. From the independents, the Formex Reef 39.5 mm is the standout microbrand take — pro diver and Looks nearly identical. Stepping up, the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition ($3,300) is where the same idea goes with a bigger budget.

54 matches
Microbrand picks· 12

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

Formex
Reef 39.5 mm
39.5mm · Automatic$2,230
Pro diver · Looks nearly identical
Henry Archer
Tidevand
40mm · Automatic$5,299
Common cross-shop · Pro diver
DOXA
SUB 300
42.5mm · Automatic$2,890
Common cross-shop · Pro diver
Phoibos
Voyager
39mm · Automatic$299
Pro diver · Visually similar
Zelos
Blacktip 41
41mm · Automatic$499
Common cross-shop · Pro diver
DOXA
SUB 250T GMT
40mm · Automatic$2,790
Common cross-shop · Pro diver
DOXA
SUB 200 C-GRAPH II
42mm · Automatic$2,890
Common cross-shop · Pro diver
Henry Archer
Nordsø
40mm · Automatic$4,999
Common cross-shop · Pro diver
Phoibos
Apollo
39mm · Automatic$460
Pro diver · Looks nearly identical
Phoibos
Eagle Ray Date
40mm · Automatic$480
Pro diver · Looks nearly identical
Islander
Islander Northport Hi-Beat Automatic Dive Watch with Ocean Blue and White Ripple Dial #ISL-195
40.5mm · Automatic$499
Pro diver · Looks nearly identical
Venezianico
Nereide Turchese
42mm · Automatic$1,395
Pro diver · Looks nearly identical
Mainstream picks· 12

Established brands covering the same brief at a comparable price — same case size, similar movement family. Often the deciding click for a new buyer.

Seiko
Prospex Sea 1965 Heritage Diver's Watch PADI Special Edition
40mm · Automatic$1,550
Shared caliber (6R55) · Same family (Prospex Sea)
Seiko
Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition
40.5mm · Automatic$1,250
Related caliber family · Same family (Prospex Sea)
Seiko
Prospex Sea 1965 Heritage Diver's Watch
40mm · Automatic$1,300
Shared caliber (6R55) · Same family (Prospex Sea)
Citizen
Promaster Fujitsubo
41mm · Automatic$1,195
Common cross-shop · Pro diver
Tissot
Seastar 2000
46mm · Automatic$1,275
Common cross-shop · Pro diver
Hamilton
Khaki Navy Scuba Auto
40mm · Automatic$975
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
GSAR (Government Search & Rescue) Diver's Automatic
41mm · Automatic$2,100
Common cross-shop · Pro diver
Marathon
OSAR-D (Original SAR with Date) Automatic 41mm
41mm · Automatic$1,800
Common cross-shop · Pro diver
Glycine
Combat Sub Box Ceramic
41mm · Automatic$1,800
Common cross-shop · Pro diver
Marathon
Jeep Rubicon GSAR
41mm · Automatic$2,100
Common cross-shop · Pro diver
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
Mako-3 AA08 Diver Watch
41.8mm · Automatic$375
Common cross-shop · Pro diver
Seiko
Prospex Sea PADI Special Edition
41.7mm · Automatic$650
Same family (Prospex Sea) · Pro diver
Orient
75th Anniversary RA-AC0Q12L30B
39.9mm · Automatic$405
Common cross-shop · Pro diver
Seiko
Prospex Sea
41.7mm · Automatic$595
Same family (Prospex Sea) · Pro diver
Seiko
Monster
42.4mm · Automatic$550
Same family (Prospex Sea) · Pro diver
Citizen
Tsuyosa Shore
40mm · Automatic$495
Common cross-shop · 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 · Pro diver
Citizen
Tsuyosa Automatic
40mm · Automatic$356
Common cross-shop · Sunburst dial
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
Seiko
Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch
42.6mm · Automatic$2,900
Pro diver · Automatic
Grand Seiko
SLGB023
40.8mm · Spring Drive$12,400
Pro diver · Visually similar
Tudor
Pelagos Ultra
40mm · Automatic$6,900
Pro diver · Visually similar
Longines
LEGEND DIVER 42
42mm · Automatic$2,850
Pro diver · Automatic
Longines
LEGEND DIVER 42 BLACK LACQUERED
42mm · Automatic$3,200
Pro diver · Automatic
Seiko
Prospex Marinemaster Marinemaster 1968 Heritage JAMSTEC Limited Edition
42.6mm · Automatic$3,900
Pro diver · Automatic
Bremont
The Meta Kronos
40mm · Automatic$3,145
Pro diver · Visually similar
Longines
LEGEND DIVER
39mm · Automatic$3,850
Pro diver · Automatic
Tudor
Pelagos 39
40mm · Automatic$5,625
Pro diver · Automatic
Tudor
Pelagos
40mm · Automatic$6,025
Pro diver · Automatic
Bremont
Supermarine 300M
40mm · Automatic$3,550
Pro diver · Automatic
Looks like this· 9

Visually-adjacent picks pulled by the image-similarity engine. Quality varies — sometimes a true twin, sometimes just a rhyme.

Sugess
Ocean Star S450 YM
40mm · Automatic$449
Pro diver · Visually similar
Pagani Design
PD-1691
39.7mm · Automatic$146
Common cross-shop · Tool diver
Pagani Design
PD-1715
40mm · Automatic$171
Common cross-shop · Tool diver
Pagani Design
PD-1821
41mm · Automatic$137
Common cross-shop · Pro diver
Sugess
Ocean Star S421
40mm · Automatic$449
Pro diver · Visually similar
Sugess
Seestern S430 Titanium Diver
40mm · Automatic$299
Pro diver · Visually similar
Seestern
Sub 300 V4
42mm · Automatic$10
Pro diver · Visually similar
Seestern
S471 Double Crown Diver
38mm · Automatic$179
Pro diver · Visually similar
Seestern
S450 Ocean Star
40mm · Automatic$299
Pro diver · Automatic