Seiko Cal. 6640 - 161

Released in 1974, the Cal. 6640 with design code 161 was part of Seiko's domestic market collection. Powered by the 6640 caliber with 29j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-e37de3ede4dc]

Also known as: Crown

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Green

Jewels

29j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1974

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