Seiko Cal. 5638 - 667

Released in 1965, the Cal. 5638 with design code 667 was part of Seiko's domestic market collection. With its 18mm lug width and 9.3mm profile, it sits comfortably on most wrists. [seikata-wm-dec5afd504fa]

Also known as: Monster, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1965

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