Seiko Cal. 6631 - 958

Released in 1968, the Cal. 6631 with design code 958 was part of Seiko's domestic market collection. Powered by the 6631 caliber with 31j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-df5dc9d07198]

Also known as: Sea Horse, Emperor

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1968

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