Seiko Cal. 6640 - 862

This Quartz model from 1975 features a 44mm Hardlex-Coated Steel case. Powered by the 6640 caliber with 25j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-1b62ae7b1d1a]

Also known as: Bullhead, Helmet

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1975

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