Seiko Cal. 3891 - 747

This Spring Drive model from 1981 features a 35mm Titanium case. Powered by the 3891 caliber with 34j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-4158d6124f6f]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Navy

Jewels

34j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1981

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