Seiko Cal. 6390 - 478

The Seiko 6390-478 represents an important milestone in Seiko's 1981 lineup. Powered by the 6390 caliber with 35j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-5dbdbb90f005]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

Black

Jewels

35j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1981

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