Seiko Cal. 3871 - 820

The 3871-820 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3871 caliber with 22j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-a021c90384e2]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Cream

Jewels

22j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1965

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