Seiko 5 Sports SRPD79K1 vs Seiko 5 Sports SRPD65K1

Both watches use the same 4R36 automatic movement with 41 hours of power reserve, day-date, and 100 m water resistance, so the choice comes down to strap and case. The SRPD79K1 is the lighter, more casual pick at 94 g on a black NATO strap, and owners praise its all-black look. The SRPD65K1 is the heavier 170 g steel-bracelet watch with a rotating dive bezel, better for someone who wants one watch for both office and pool. Reviewers rate the SRPD79K1 highly, and the 4R36 is widely regarded as a reliable, serviceable workhorse in both.

• Choose the Seiko 5 Sports SRPD79K1 if you want a light, all-black everyday watch on a comfortable NATO strap and don't need a rotating bezel.
• Choose the Seiko 5 Sports SRPD65K1 if you want a steel bracelet, a timing bezel and a screw-down crown in one tougher-feeling package.