
48 watches that match on case size, movement family, and price band. Sorted by how close the match is.
The closest alternative to the Seiko Sumo is the Tissot Seastar 1000 ($515) — common cross-shop and Pro diver. If price is the constraint, the Casio MDV-106 Duro at $85 (vs $762 for the Sumo) covers most of the same brief. From the independents, the Zelos Hammerhead V3 300m is the standout microbrand take — common cross-shop and Pro diver. Stepping up, the Glycine Men's Combat Sub Sport GMT 42mm Automatic Watch GL0383 ($2,995) is where the same idea goes with a bigger budget.
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.