Seiko Cal. 3871 - 905

The 3871-905 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3871 caliber with 21j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-e31dd31a3a86]

Also known as: Bullhead, Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

11.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Burgundy

Jewels

21j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1987

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