Seiko Cal. 6644 - 866

This Spring Drive model from 1975 features a 40mm Stainless Steel case. Powered by the 6644 caliber with 36j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-3f5eb72d61f3]

Also known as: UFO, Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

12.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

40m

Dial Color

Burgundy

Jewels

36j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1975

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