Seiko Cal. 3851 - 531

This Hand-Winding model from 1970 features a 44mm Two-Tone case. Powered by the 3851 caliber with 26j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-5593b089cbb1]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1970

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