Seiko Cal. 6636 - 401

The 6636-401 is a sought-after Spring Drive piece from Seiko's golden era. With its 22mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-374c7b853738]

Also known as: Panda, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

70m

Dial Color

Green

Jewels

21j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1978

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