Seiko Cal. 3860 - 640

This Spring Drive model from 1972 features a 34mm Hardlex-Coated Steel case. Powered by the 3860 caliber with 32j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-0cb639e8533e]

Also known as: Sportsmatic, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Burgundy

Jewels

32j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1972

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