Seiko Cal. 6637 - 377

This Spring Drive model from 1987 features a 37mm PVD Black case. Powered by the 6637 caliber with 21j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-48992f3ef850]

Also known as: Samurai, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Burgundy

Jewels

21j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1987

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