See Doug Smith's post on CC>CC board here --
http://www.ccgtcc.com/cgi-bin/bbs521/webbbs_config.pl/page/1/md/read/id/60266/sbj/ex-favorite-of-the-week-colorado-week-63/

Also listed in Campiglia & Wells book on pg. 332.

If yours is unnotched, as it appears, it's very valuable, according to all the info.