Seiko Cal. 6390 - 944

The 6390-944 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6390 caliber with 20j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-4e9d2e1759e3]

Also known as: Monster, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1969

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