Seiko Cal. 6640 - 508

The 6640-508 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6640 caliber with 29j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-1306604f9bbe]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

100m

Dial Color

Burgundy

Jewels

29j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1984

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