Seiko Cal. 5631 - 496

The Seiko 5631-496 represents an important milestone in Seiko's 1977 lineup. Powered by the 5631 caliber with 27j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-62ccc73cfdc5]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

35mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Champagne

Jewels

27j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1977

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