Seiko Cal. 6640 - 509

The Seiko 6640-509 represents an important milestone in Seiko's 1994 lineup. Powered by the 6640 caliber with 27j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-df84ebc49afd]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Burgundy

Jewels

27j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1994

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