Seiko Cal. 3812 - 178

The 3812-178 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3812 caliber with 34j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-c941327ea3ad]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

13.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Champagne

Jewels

34j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1967

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