Seiko Cal. 6631 - 144

The 6631-144 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6631 caliber with 31j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-651e4d1612dc]

Also known as: Samurai, Flighty

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

30m

Dial Color

Champagne

Jewels

31j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1973

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