Seiko Cal. 6640 - 481

The 6640-481 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6640 caliber with 24j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-894c4b556dfb]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Champagne

Jewels

24j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1966

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