Seiko Prospex Marinemaster 1968 Heritage Diver's WatchvsSan Martin Vintage MM300 Automatic SN0087

Owners and reviewers widely praise the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch for its exceptional finishing, comparable to Grand Seiko, and refined design, with particular appreciation for its case shape and the 4:00 crown position. The watch is noted for its enjoyable look and feel, and some consider it a significant step up from standard Prospex models, offering premium finishing and a tool-like appearance. The movement Seiko 8L45 is mentioned, along with a 72-hour power reserve and an accuracy of -5/+10 seconds per day. However, some find the price point high, and one reviewer noted the unsigned winding crown as a missed opportunity for a watch in this price range. On balance, owners and reviewers rate the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch highly for its exceptional finishing and refined design at its price point.

The San Martin Vintage MM300 Automatic SN0087 is praised for its top-notch case and handset finishing, consistent with the brand's reputation. Despite its 44mm case and 14mm thickness, owners report it wears noticeably smaller and fits comfortably on a 7" wrist. Some owners find the design a "messy mixup" and note the lume is an "ugly yellow," preferring BGW9 over C3. One owner found the pin and collar bracelet difficult to resize, with the half-link prone to damage. Overall, owners rate the San Martin Vintage MM300 Automatic SN0087 highly for its impressive finishing and comfortable wearability despite its dimensions.