My father got this approx 35 years ago from Jim Clark Sr. Custom Colt Gold Cup on a 6" slide.
http://i1113.photobucket.com/albums/...psff77388d.jpg
http://i1113.photobucket.com/albums/...ps3dbc0bd2.jpg
http://i1113.photobucket.com/albums/...ps397e7049.jpg