Seiko Cal. 6640 - 310

The 6640-310 is a sought-after Hand-Winding piece from Seiko's golden era. With its 20mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-c36bc54bb8b3]

Also known as: Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

10.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

150m

Dial Color

White

Jewels

19j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1998

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