Seiko Cal. 3897 - 640

This Quartz model from 1978 features a 36mm Hardlex-Coated Steel case. Powered by the 3897 caliber with 26j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-87dd88de74f5]

Also known as: World Timer

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Silver

Jewels

26j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1978

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