Seiko Cal. 6637 - 316

This Hand-Winding model from 1980 features a 45mm Stainless Steel case. The Bidirectional bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-c69a1e81e5ba]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

15.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Green

Jewels

34j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1980

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