Seiko Cal. 5631 - 520

The Seiko 5631-520 represents an important milestone in Seiko's 1987 lineup. Powered by the 5631 caliber with 19j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-7bb53be6c067]

Also known as: Pogue, Emperor

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

19j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1987

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