Seiko Cal. 6640 - 453

The Seiko 6640-453 represents an important milestone in Seiko's 1985 lineup. Powered by the 6640 caliber with 20j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-0889a8964f29]

Also known as: Helmet, Rally

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

13.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1985

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