
43 watches that match on case size, movement family, and price band. Sorted by how close the match is.
The closest alternative to the Undone Aqua Carbon Maggy is the Seiko Prospex Sea The Black Series ($765) — pro diver and Looks nearly identical. If price is the constraint, the Orient Kanno at $320 (vs $680 for the Aqua Carbon Maggy) covers most of the same brief. From the independents, the Duxot Atlantica Deep Dive Automatic Limited Edition is the standout microbrand take — shared caliber (Seiko NH35) and Pro diver. Stepping up, the Omega Seamaster Diver 300M Co Axial Master Chronometer 43 5mm ($10,000) 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.