Seiko Cal. 6636 - 643

The 6636-643 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6636 caliber with 26j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-b1c236d17012]

Also known as: Panda, Crown

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Cream

Jewels

26j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1973

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