Seiko Cal. 6631 - 912

The Seiko 6631-912 represents an important milestone in Seiko's 1985 lineup. Powered by the 6631 caliber with 27j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-8876321c7e73]

Also known as: Turtle, Sumo

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

8.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Black

Jewels

27j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1985

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