[CR] Windsor (real Mexican ones) frame tubesets?

I'm being given a Windsor Carrera Sport by my Great-Eddy-Merckx-Riding-Buddy Chuck Johnston from Colorado. (Thanks Chuck!)  It's a Carrera Sport, but has a Columbus tubing decal. (see pics at:  http://www.flickr.com/photos/davefromaine/ )

Anyone heard of this lower-end Windsor being made with anything other than Chromoly or Tange?  I assume the foil decal is original given the condition of the paint.

Dave Whitney
Poland, Maine USA