Seiko Cal. 6640 - 933

The Seiko 6640-933 represents an important milestone in Seiko's 1969 lineup. Powered by the 6640 caliber with 33j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-bcd3e0f74c83]

Also known as: Bellmatic, Flighty

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1969

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