Seiko Cal. 3812 - 140

The 3812-140 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3812 caliber with 27j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-92fe535ac37f]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

27j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1976

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