Seiko Cal. 3878 - 305

This Spring Drive model from 1979 features a 41mm Two-Tone case. Powered by the 3878 caliber with 34j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-fa3f8e1a5021]

Also known as: Baby Tuna, Emperor

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

9.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Silver

Jewels

34j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1979

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