Seiko Cal. 6636 - 540

This Spring Drive model from 1969 features a 38mm Hardlex-Coated Steel case. Powered by the 6636 caliber with 33j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-a00bedfca999]

Also known as: Sumo, Goldfeather

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1969

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