Seiko Cal. 3859 - 720

This Spring Drive model from 1967 features a 39mm Two-Tone case. Powered by the 3859 caliber with 18j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-073fdbe17e48]

Also known as: Helmet, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Champagne

Jewels

18j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1967

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