Seiko Cal. 3878 - 999

The Seiko 3878-999 represents an important milestone in Seiko's 1977 lineup. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-ec78a3bcfe58]

Also known as: Monster, Emperor

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

14.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Silver

Jewels

18j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1977

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