Seiko Cal. 3873 - 631

This Spring Drive model from 1974 features a 39mm Two-Tone case. Powered by the 3873 caliber with 26j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-b78a90d81ef8]

Also known as: UFO, Silverwave

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1974

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