Seiko Cal. 3878 - 637

The 3878-637 is a sought-after Solar piece from Seiko's golden era. With its 21mm lug width and 14.2mm profile, it sits comfortably on most wrists. [seikata-wm-0d5cb8db0722]

Also known as: Helmet, Emperor

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Black

Jewels

18j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1987

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