Seiko Cal. 5631 - 654

The Seiko 5631-654 represents an important milestone in Seiko's 1980 lineup. Powered by the 5631 caliber with 34j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-0906285a64eb]

Also known as: Monster, Rally

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

8.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Navy

Jewels

34j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1980

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