Seiko Cal. 5661 - 636

The Seiko 5661-636 represents an important milestone in Seiko's 1971 lineup. Powered by the 5661 caliber with 22j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-b86837de22c3]

Also known as: Samurai, Monster

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

9.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

180m

Dial Color

Green

Jewels

22j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1971

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