Seiko Cal. 3864 - 780

The 3864-780 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3864 caliber with 17j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-552c778009de]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Silver

Jewels

17j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1975

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