Seiko Cal. 3878 - 524

The 3878-524 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3878 caliber with 30j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-dd6ff06e135a]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

100m

Dial Color

White

Jewels

30j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1975

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