Seiko Cal. 3899 - 646

This Spring Drive model from 1978 features a 34mm Titanium case. Powered by the 3899 caliber with 18j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-91d75daccb62]

Also known as: UFO, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

34mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

80m

Dial Color

Black

Jewels

18j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1978

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