Seiko Cal. 3878 - 701

The 3878-701 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3878 caliber with 28j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-25429856ca00]

Also known as: Monster, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1979

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