Seiko Cal. 6640 - 852

The Seiko 6640-852 represents an important milestone in Seiko's 1975 lineup. Powered by the 6640 caliber with 27j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-2cc0ddaf9887]

Also known as: UFO, Arnie

Specifications

Movement

Solar

Case Material

Titanium

Case Width

37mm

Case Thickness

10.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

Burgundy

Jewels

27j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1975

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