Seiko Cal. 6643 - 713

The Seiko 6643-713 represents an important milestone in Seiko's 1971 lineup. Powered by the 6643 caliber with 17j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-5baca328fb74]

Also known as: Helmet, Bellmatic

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

White

Jewels

17j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1971

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