Seiko Cal. 3878 - 240

The 3878-240 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3878 caliber with 35j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-a36cd950afa5]

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

90m

Dial Color

Champagne

Jewels

35j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1975

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