Seiko Cal. 5637 - 680

This Spring Drive model from 1969 features a 36mm Hardlex-Coated Steel case. It features a White dial protected by a Sapphire crystal and offers 130m of water resistance. [seikata-wm-0bc6ffe430dd]

Also known as: Tuna, World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

White

Jewels

19j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1969

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