
36 watches that match on case size, movement family, and price band. Sorted by how close the match is.
The closest alternative to the Watchdives x San Martin Classic 39mm Automatic Dive Watch SN0121G is the AETHELSOHN Mariner ($259) — shared caliber (Seiko NH35) and Pro diver. From the independents, the Thorn SHY027 39mm BB58 Vintage Diver Automatic Watch is the standout microbrand take — shared caliber (Seiko NH35) and Pro diver. Stepping up, the Christopher Ward C60 Trident Pro 600 ($1,090) 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.
Where the same idea goes when budget isn't the constraint: luxury upgrades and step-ups.