Seiko Cal. 6378 - 684

This Spring Drive model from 1984 features a 39mm Hardlex-Coated Steel case. Powered by the 6378 caliber with 28j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-731213299ea8]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Burgundy

Jewels

28j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1984

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