Seiko Cal. 5638 - 837

This Hand-Winding model from 1978 features a 40mm Gold-Plated case. With its 21mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-57d995d23b6d]

Also known as: Rally, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

13.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1978

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