Seiko Cal. 5631 - 780

This Hand-Winding model from 1973 features a 41mm PVD Black case. It features a White dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-8a68f4303165]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

10.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1973

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