Seiko Cal. 3847 - 791

The 3847-791 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3847 caliber with 18j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-a071ca1ae9a2]

Also known as: Monster, Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

39mm

Case Thickness

12.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Black

Jewels

18j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1968

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