Seiko Cal. 5638 - 316

This Hand-Winding model from 1985 features a 40mm Titanium case. It features a White dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-acb4cae3810a]

Also known as: Sumo, World Timer

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

8.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1985

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