Seiko SRPE51K1

Seiko SRPE51K1

Movement: Seiko 4R36 automatic (manual winding + hacking)
Power reserve: ~41 hours
Case: Stainless steel
Size: 40 mm ⭐
Thickness: ~11.5–12 mm
Crystal: Hardlex (Seiko hardened mineral)
Water resistance: 100 m (10 ATM)
Functions:
day + date
stop-seconds function
manual winding
Case back: yes (transparent)
Bezel: polished fixed (not a rotating diver's bezel)
Style: sport-chic / daily watch / “DressKX”