Seiko Cal. 6390 - 744

The Seiko 6390-744 represents an important milestone in Seiko's 1965 lineup. Powered by the 6390 caliber with 31j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-86b328cb53ed]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

38mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1965

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