Seiko Cal. 3878 - 365

The 3878-365 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3878 caliber with 28j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-29d85bb13072]

Also known as: Tuna, Arnie

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

8.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

80m

Dial Color

Black

Jewels

28j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1983

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