Seiko Cal. 5663 - 231

This Spring Drive model from 1977 features a 39mm Stainless Steel case. With its 22mm lug width and 8.4mm profile, it sits comfortably on most wrists. [seikata-wm-0ae86a4d9baa]

Also known as: Monster, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

8.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

90m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1977

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