Seiko Cal. 3880 - 657

This Spring Drive model from 1975 features a 41mm Two-Tone case. With its 21mm lug width and 8.6mm profile, it sits comfortably on most wrists. [seikata-wm-21d304281733]

Also known as: Helmet, Emperor

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1975

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