Seiko Cal. 6640 - 300

The Seiko 6640-300 represents an important milestone in Seiko's 1976 lineup. Powered by the 6640 caliber with 20j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-3133da9db732]

Also known as: Bullhead, Arnie

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1976

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