Seiko Cal. 6645 - 636

The 6645-636 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6645 caliber with 36j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-2bcaaa4ac6e9]

Also known as: Samurai, Rally

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

12.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Cream

Jewels

36j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1983

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