Serket Watch Co Reef Mariana
Finding alternatives to

Serket Watch Co Reef Mariana

Ref. SWC2025RMDOB0001

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

Case
40mm
Movement
Automatic
MSRP
$449
The short answer

The closest alternative to the Serket Watch Co Reef Mariana is the Arethusa Watch Co World Diver — shared caliber (Seiko NH35) and Pro diver. If price is the constraint, the Aigi Watches BARENTS SEA AUTOMATIC round dive watch 43mm, applied markers + date + dive bezel at $180 (vs $449 for the Reef Mariana) covers most of the same brief. From the independents, the Ugly Watch Co 300mD is the standout microbrand take — shared caliber (Seiko NH35) and Pro diver. Stepping up, the Seiko 62MAS ($1,200) is where the same idea goes with a bigger budget.

50 matches
Microbrand picks· 12

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

Ugly Watch Co
300mD
42mm · Automatic$250
Shared caliber (Seiko NH35) · Pro diver
Ventus Watches
Northstar
40mm · Automatic$349
Shared caliber (Seiko NH35) · Pro diver
Serket Watch Co
Reef X Diver
43mm · Automatic$499
Shared caliber (Seiko NH35) · Same family (REEF)
DIFICIANO
Marlin
40mm · Automatic$399
Shared caliber (Seiko NH35) · Pro diver
Ventus Watches
Mori
41mm · Automatic$349
Shared caliber (Seiko NH35) · Pro diver
William Wood
Hollywood Fire Rescue Centennial Watch
41mm · Automatic$820
Shared caliber (Seiko NH35) · Pro diver
William Wood
International Association of Fire
41mm · Automatic$820
Shared caliber (Seiko NH35) · Pro diver
William Wood
National Fallen Firefighters Foundation Watch
41mm · Automatic$820
Shared caliber (Seiko NH35) · Pro diver
DIFICIANO
Narwhal
38mm · Automatic$419
Shared caliber (Seiko NH35) · Pro diver
Boldr
Merlion 50th Anniversary
40mm · Automatic$449
Shared caliber (Seiko NH35) · Pro diver
Islander
Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311
40mm · Automatic$399
Shared caliber (Seiko NH35) · Pro diver
Pompeak
Sub-Aquatic
40mm · Automatic$915
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.

Arethusa Watch Co
World Diver
40mm · Automatic
Shared caliber (Seiko NH35) · Pro diver
Tissot
Seastar Wilson WNBA
40mm · Automatic$875
Pro diver · Looks nearly identical
Seiko
Prospex Sea
41.7mm · Automatic$595
Pro diver · Looks nearly identical
Tissot
Seastar 1000
40mm · Automatic$875
Pro diver · Visually similar
Alkin Watches
Model Three Diver
40.5mm · Automatic$582
Pro diver · Automatic
Aigi Watches
ARCTIC DIVER
41mm · Automatic$480
Shared caliber (Seiko NH35) · Looks nearly identical
Aigi Watches
Arctic Diver Black Dive Watch
41mm · Automatic$480
Shared caliber (Seiko NH35) · Looks nearly identical
Alkin Watches
Model Three Dual Time
40.5mm · Automatic$582
Pro diver · Automatic
Orient
AC0Q-40 Diver Watch
39.9mm · Automatic$370
Pro diver · Visually similar
Seiko
Monster
42.4mm · Automatic$550
Pro diver · Looks nearly identical
Orient
AC0Q-40 RA-AC0Q05P10B
39.9mm · Automatic$355
Pro diver · Visually similar
Orient
AA08 Diver Watch
41.8mm · Automatic$390
Pro diver · Looks nearly identical
Cheaper alternatives· 5

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

Aigi Watches
BARENTS SEA AUTOMATIC round dive watch 43mm, applied markers + date + dive bezel
43mm · Automatic$180
Shared caliber (Seiko NH35) · Visually similar
Alexander James Watches
A4 Legacy Dress 37 pilot/field 3-hand date, printed Arabic numerals (PVD cushion case)
37.4mm · Automatic$200
Shared caliber (Seiko NH35) · Automatic
Aigi Watches
BARENTS SEA AUTOMATIC
43mm · Automatic$180
Shared caliber (Seiko NH35) · Automatic
Ajwain Watches
DEVI - A Tribute to Divine Strength
39mm · Automatic$180
Automatic · Same size
Ajwain Watches
Khaki edition
38mm · Manual$170
Similar size · 62% less
Pricier alternatives· 12

Where the same idea goes when budget isn't the constraint — luxury upgrades and step-ups.

Seiko
62MAS
40.5mm · Automatic$1,200
Pro diver · Visually similar
Marathon
OSAR-D (Original SAR with Date) Automatic 41mm
41mm · Automatic$1,800
Pro diver · Looks nearly identical
Seiko
Prospex Sea
41mm · Automatic$900
Pro diver · Visually similar
Marathon
Arctic OSAR 41mm Automatic
41mm · Automatic$1,800
Pro diver · Visually similar
Tudor
Black Bay 58 GMT
39mm · Automatic$5,525
Pro diver · Looks nearly identical
Seiko
Prospex Sea 1965 Heritage Diver's Watch
40mm · Automatic$1,300
Pro diver · Visually similar
Tudor
Black Bay 58
39mm · Automatic$5,350
Pro diver · Visually similar
Marathon
Jeep Rubicon TSAR
41mm · Automatic$1,650
Pro diver · Visually similar
Glycine
Combat Sub Box Ceramic
41mm · Automatic$1,800
Pro diver · Visually similar
Tudor
Black Bay 58 925
39mm · Automatic$5,600
Pro diver · Visually similar
Longines
HYDROCONQUEST
39mm · Automatic$2,350
Pro diver · Visually similar
Glycine
Combat Sub Sport GMT
42mm · Automatic$2,995
Pro diver · Visually similar
Looks like this· 9

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

Seestern
Sub 300 V4
42mm · Automatic$10
Shared caliber (Seiko NH35) · Pro diver
Sugess
Seestern 62MAS V3
39mm · Automatic$199
Shared caliber (Seiko NH35) · Pro diver
Sugess
Seestern DOX V3
42mm · Automatic$199
Shared caliber (Seiko NH35) · Pro diver
Sugess
Seestern Vintage S407 600T
39mm · Automatic$249
Pro diver · Looks nearly identical
Pagani Design
PD-1758 GMT
40mm · Automatic$142
Pro diver · Looks nearly identical
Pagani Design
PD-1726
40mm · Automatic$155
Pro diver · Looks nearly identical
Pagani Design
PD-1762 GMT II NH34
40mm · Automatic$213
Pro diver · Looks nearly identical
Seestern
S450 Ocean Star
40mm · Automatic$299
Pro diver · Visually similar
Seestern
S443 Column Wheel Chronograph
40mm · Manual$10
Pro diver · Visually similar