Seiko Cal. 3870 - 764

This Quartz model from 1978 features a 44mm PVD Black case. Powered by the 3870 caliber with 20j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-e2acb1361949]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

44mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1978

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