Seiko Prospex Sea 1968 Heritage Diver's GMTvsYema Superman Tourbillon CMM.31 Limited Edition

The Seiko Prospex Sea 1968 Heritage Diver's GMT is widely praised for its build quality, finishing, and value, with owners noting its comfortable wearability and attractive aesthetic, particularly the silver/white sunray dial and blue ceramic bezel. The improved bracelet clasp with excellent micro-adjustment is a recurring positive point. Some owners report accuracy figures of +3 seconds per day or +/- 5 seconds per day, exceeding the movement's stated range. However, the GMT functionality is considered secondary to its dive watch capabilities by some, with the GMT scale being difficult to read and the caller-style GMT movement being a drawback for certain users. The dial contrast is also noted as lacking by some, and the crown at 4 o'clock is undesirable for a few. On balance, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT highly for its blend of dive watch character and GMT functionality, offering significant features for its price.

The Yema Superman Tourbillon CMM.31 Limited Edition is a titanium dive watch praised for its manufacture tourbillon and remarkable price point around €12,000. Owners describe it as an "incredible piece" and a "crazy watch" with impressive specifications, appreciating the "unnecessary" complication. While the 43mm case size is noted as large, its 13.8mm thickness and titanium construction contribute to comfort, though the bracelet clasp's extension system is considered somewhat crude. On balance, owners and reviewers rate the Yema Superman Tourbillon CMM.31 Limited Edition highly for offering a tourbillon complication at a compelling price point, despite some reservations about case size and bracelet finishing.