Seiko Cal. 6640 - 148

This Solar model from 1971 features a 36mm Hardlex-Coated Steel case. Powered by the 6640 caliber with 25j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-8841f5ba6d45]

Also known as: Monster

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Cream

Jewels

25j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1971

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