Seiko Cal. 5631 - 917

The Seiko 5631-917 represents an important milestone in Seiko's 1986 lineup. Powered by the 5631 caliber with 32j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-61bdbadac06a]

Also known as: UFO, Flighty

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

39mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Silver

Jewels

32j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1986

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