Seiko Cal. 6390 - 728

The Seiko 6390-728 represents an important milestone in Seiko's 1978 lineup. Powered by the 6390 caliber with 30j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-b76c5b700ed7]

Also known as: Goldfeather, Crown

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Burgundy

Jewels

30j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1978

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