Seiko 5 Sports SRPD51 Automatic Watch

24-jewel automatic movement, 100m water resistance, day-date display, blue dial on a steel bracelet — Seiko making the case that you don't need to spend four figures on a serious sport watch.

The Seiko 5 Sports SRPD51 is what you get when a company with nearly 140 years of watchmaking decides to build a proper sport automatic without cutting corners on what actually matters. The 24-jewel automatic movement keeps accurate time without a battery and can be hand-wound when needed — a level of mechanical engagement that quartz simply doesn't offer. 100 meters of water resistance means it handles swimming and daily wear without drama. The 42.5mm blue dial on a steel bracelet reads boldly as a sport watch but dresses down well enough for business casual. Day and date window at 3 o'clock. Seiko builds these to last, and the SRPD51 has become a genuine benchmark in the affordable automatic category — the watch that serious enthusiasts recommend when someone asks where to start. 1,100+ Amazon ratings at 4.6 stars. If he appreciates the idea of a mechanical watch but isn't ready to spend four figures to get there, this is the right answer.