Seiko Cal. 6637 - 964

This Spring Drive model from 1983 features a 45mm Stainless Steel case. It features a Black dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-8b4bb882788f]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Black

Jewels

18j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1983

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