Seiko Cal. 3878 - 510

The 3878-510 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 58 hours power reserve. [seikata-wm-451129ad11be]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

9.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

White

Jewels

27j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1990

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