Guys, I purchased this Red Stockings "photo disc" in the 2011 REA auction (see link, below). It's made of thick paper/thin cardboard, surrounded by a metallic ring. A little larger than a Colgan's card. It looks like a pin, but there is really no evidence of any kind of pin attachment on the back. I've never seen another example, but it clearly was a manufactured item, and not homemade. Since we're kind of on the subject, I've always wondered if anyone knows any more about it? ~ Ken
http://robertedwardauctions.com/auction/2011/1186.html