Seiko Cal. 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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