
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 Prospex Sea is the Tissot Seastar 1000 ($515) — common cross-shop and Pro diver. If price is the constraint, the Tissot PR 100 Jungfraubahn at $395 (vs $795 for the Prospex Sea) covers most of the same brief. From the independents, the Vaer DS2 Meridian Quartz 36mm is the standout microbrand take — common cross-shop and Pro diver. Stepping up, the TAG Heuer Aquaracer ($2,550) 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.