About 5-6 years ago someone contacted me after seeing a sign on a mountain bike trail in Colorado warning of possible duds, with a bizarre picture of a round. I'd never seen one, and spent a week or so hunting on the internet before I tracked this company down. Speaking with the owner I attempted to purchase a round, he instead sold me most of his personal collection, about 6-8 pieces including the current round, many of his developmental items, a Swiss round and an Italian round. Many of the pieces are very simple, in some cases just a rock blasting cast booster (pentolite) with fins and a nose. He identified that they had had a lot of difficulty with the development of the fuze, and at one time apparently a park ranger was killed in a mishap.
I'll try and take a picture or two of the pieces this weekend. Some of them may have already been used on a thread, I don't remember.