Seiko Cal. 5631 - 136

The Seiko 5631-136 represents an important milestone in Seiko's 1969 lineup. Powered by the 5631 caliber with 31j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-da6cc0a261b0]

Also known as: Monster, Shogun

Specifications

Movement

Solar

Case Material

Titanium

Case Width

40mm

Case Thickness

10.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Cream

Jewels

31j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1969

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