Seiko Cal. 3878 - 521

The 3878-521 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3878 caliber with 22j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-0333bd55660a]

Also known as: Bellmatic, Navigator

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Black

Jewels

22j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1998

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