Seiko Cal. 3899 - 646

Seiko 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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