Seiko Cal. 6390 - 745

This Hand-Winding model from 1968 features a 37mm Hardlex-Coated Steel case. Powered by the 6390 caliber with 33j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-385ffad62639]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.9mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1968

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