Seiko Cal. 6636 - 943

The 6636-943 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6636 caliber with 20j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-a5ecc9680371]

Also known as: Samurai, UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1975

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