Seiko Cal. 6639 - 183

This Spring Drive model from 1972 features a 37mm Titanium case. It features a Navy dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-3c1691b44a8b]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1972

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