Seiko Cal. 3878 - 931

This Spring Drive model from 1975 features a 42mm Titanium case. Powered by the 3878 caliber with 22j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-46489f5e8c3d]

Also known as: Emperor

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

9.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1975

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