There's an article on "The History of the Australian Shepherd" by Philip C. Wildhagen, ASCA Historian, which was originally published in the 1977 ASCA Yearbook, on the Stockdog Library section of the Working Aussie Source website. The article says that the Glenwherry Collie was a small black and gold dog of the Border Collie type. http://www.workingaussiesource.com/stockdoglib/wildhagen_history_article.htm
I have been looking for any information on Glenwherry Collies also. I had a DNA test done on my dog. There is 22.2% Supermutt and their guess includes Collie. My dog is 50% Dachshund and 28.8% Australian Shepherd, and looks a lot like the Glenwherry Collie in that old photo.