Seiko Cal. 6637 - 122

This Spring Drive model from 1985 features a 37mm PVD Black case. Powered by the 6637 caliber with 17j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-bc4353feb4c5]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

9.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

130m

Dial Color

Silver

Jewels

17j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1985

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