
54 watches that match on case size, movement family, and price band. Sorted by how close the match is.
The closest alternative to the Synchron Poseidon Ice Diver is the Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition ($1,750) — pro diver and Looks nearly identical. If price is the constraint, the Seiko Prospex Sea at $625 (vs $1,290 for the Poseidon Ice Diver) covers most of the same brief. From the independents, the Synchron Poseidon is the standout microbrand take — shared caliber (La Joux-Perret G100) and Same family (Poseidon). Stepping up, the Linde Werdelin Biformeter Elemental – Black Dial ($5,206) 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.
Visually-adjacent picks pulled by the image-similarity engine. Quality varies — sometimes a true twin, sometimes just a rhyme.