Seiko Cal. 5643 - 880

This Spring Drive model from 1970 features a 36mm Titanium case. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 170m of water resistance. [seikata-wm-235db909bcdd]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

15.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1970

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