Seiko Cal. 3878 - 121

The Seiko 3878-121 represents an important milestone in Seiko's 1973 lineup. Powered by the 3878 caliber with 27j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-5c4c805b9c42]

Also known as: Bellmatic, Golden Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

27j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1973

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