Seiko Cal. 6660 - 831

The Seiko 6660-831 represents an important milestone in Seiko's 1970 lineup. Powered by the 6660 caliber with 30j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-1999f6f18b21]

Also known as: Helmet, Rally

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

42mm

Case Thickness

9.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

180m

Dial Color

White

Jewels

30j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1970

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