Seiko Cal. 5663 - 642

This Spring Drive model from 1978 features a 38mm Stainless Steel case. With its 21mm lug width and 8.4mm profile, it sits comfortably on most wrists. [seikata-wm-56c5166a59b6]

Also known as: Rally, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

8.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

White

Jewels

32j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1978

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