Seiko SRPE17J1 vs Seiko 5 Sports SRPD65K1

Both are Seiko automatics with the same 41-hour power reserve, but they are built for different wrists. The SRPE17J1 is the dressier, slimmer everyday watch: 40.5 mm wide, 11.8 mm thick, 47.5 mm lug-to-lug, 135 g, on a deployment clasp. The SRPD65K1 is the sportier Seiko 5: 42.5 mm wide, 13.4 mm thick, 170 g, with a rotating dive bezel, Lumibrite, a screw-down crown and a display back. Owners of the SRPE line praise the thin case and clean dial; Seiko 5 owners like the bezel and lume but note the extra bulk.

• Choose the Seiko SRPE17J1 if you want a slim, light, understated automatic that slips under a cuff and works in an office.
• Choose the Seiko 5 Sports SRPD65K1 if you want a dive-style bezel, strong lume and a sportier look for weekends and water.