Seiko Cal. 6640 - 497

The 6640-497 is a sought-after Hand-Winding piece from Seiko's golden era. With its 18mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-78efc278d692]

Also known as: Samurai, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

39mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1975

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