Seiko Cal. 3879 - 640

Seiko 3879-640

The Seiko 3879-640 represents an important milestone in Seiko's 1978 lineup. Powered by the 3879 caliber with 24j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-1fb734529dfb]

Also known as: Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
8.9mm
Lug Width
20mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
190m
Dial Color
Silver
Jewels
24j
Frequency
36,000 bph
Power Reserve
64 hours
Year
1978

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