Marathon JDD (Jumbo Day/Date) Anthracite Diver's AutomaticvsSan Martin Automatic Dive SN0123G

The Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic is widely praised as a tough, underrated tool watch with excellent legibility due to its tritium lume. Owners appreciate its robust build and lifestyle appeal, though its 46mm size is a common point of criticism, with some finding it heavy and top-heavy. One reviewer noted the white day/date discs clash with the anthracite dial, and an owner observed the watch running about 10 seconds fast over three days. On balance, owners and reviewers rate the Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic highly for its robust build and excellent legibility as a tool watch, despite its substantial size.

Owners widely praise the San Martin Automatic Dive SN0123G for its exceptional value, noting fantastic lume and construction for the price, with many appreciating the sandblasted steel finish and asymmetric case design as a wicked retro look. The bezel is found useful for tracking a second time zone. However, some owners find the 44mm case too large for smaller wrists. Accuracy varies, with one owner reporting a loss of about 3 seconds per day. One owner noted a crooked 6 o'clock index. Overall, owners rate the San Martin Automatic Dive SN0123G highly for its impressive finishing and tool watch utility at an accessible price point.