Seiko Cal. 3864 - 635

This Spring Drive model from 1970 features a 44mm PVD Black case. Powered by the 3864 caliber with 31j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-6e847c9b8405]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

13.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1970

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