I think I located the piece you asked me about, previously.

Is this it --> http://community.webtv.net/BENEDICT/doc13 ?

If so, it's 32mm; made by the French chip manufacturer Bourgogne et Grasset, and I know it was in play in July, 1972.

I've seen the piece sell for as much as $40, and as little as a few dollars as part of a grouping on eBay Auctions.

JB