Seiko Cal. 6640 - 372

This Hand-Winding model from 1980 features a 39mm Two-Tone case. Powered by the 6640 caliber with 24j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-6b738eb2a354]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Green

Jewels

24j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1980

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