Seiko Cal. 6640 - 807

The 6640-807 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6640 caliber with 31j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-215ec43ffffe]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

11.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Champagne

Jewels

31j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1978

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