Seiko Cal. 6637 - 316

Seiko 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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seikata-wm-c69a1e81e5ba