Seiko Cal. 3878 - 929

The Seiko 3878-929 represents an important milestone in Seiko's 1980 lineup. Powered by the 3878 caliber with 30j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-8241d18d02aa]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

190m

Dial Color

Silver

Jewels

30j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1980

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