Seiko Cal. 3878 - 852

The 3878-852 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3878 caliber with 27j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-59df89c206d3]

Also known as: UFO, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1970

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