Seiko Cal. 6638 - 544

This Spring Drive model from 1982 features a 41mm Stainless Steel case. It features a Navy dial protected by a Mineral crystal and offers 80m of water resistance. [seikata-wm-7ddbbe8d65e8]

Also known as: Monster, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1982

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