Seiko Cal. 6660 - 790

The Seiko 6660-790 represents an important milestone in Seiko's 1991 lineup. Powered by the 6660 caliber with 23j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-8b84e3d05f18]

Also known as: Tuna, World Timer

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

44mm

Case Thickness

14.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Cream

Jewels

23j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1991

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