Seiko Cal. 3868 - 640

Seiko 3868-640

The Seiko 3868-640 represents an important milestone in Seiko's 1979 lineup. Powered by the 3868 caliber with 36j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-75bbc1735b58]

Also known as: Helmet, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
34mm
Case Thickness
11.4mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
150m
Dial Color
Green
Jewels
36j
Frequency
21,600 bph
Power Reserve
49 hours
Year
1979

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