
48 watches that match on case size, movement family, and price band. Sorted by how close the match is.
The closest alternative to the Seagull Ocean Series Ultra 1000m Waterproof Helium Valve Design Integrated Rotating Bezel Diving Watch 45mm is the Glycine Men's Airman SST GMT 43mm Automatic Watch GL0310 ($905) — pro diver and Looks nearly identical. If price is the constraint, the Invicta Pro Diver 18160 covers most of the same brief. From the independents, the Seagull Ocean Series Pro 300m Waterproof Diving Watch 44mm is the standout microbrand take — shared caliber (Seagull ST2130) and Same family (Dive Watch).
Independent makers covering the same brief, usually with something the mainstream brands don't.
Established brands covering the same brief at a comparable price: same case size, similar movement family. Often the deciding click for a new buyer.
If the price is the only thing keeping you off this watch, these get you most of the way there for less.
Where the same idea goes when budget isn't the constraint: luxury upgrades and step-ups.