I recently "test drove" one of the 62 series (the shallowest) and, IMHO, it had a very comfortable rim. It seemed open to me and with my large bore Calicchio, I wasn't convinced it would be efficient enough for my needs. It would probably work out much better on a ML bore horn.
The think the older ones were stamped Port Chester, NY. I thought I read somewhere that the same guy that brought back the Rudy Muck line was also bringing back the Zottola.
Try one (or all) of these links....
http://www.zottolamouthpieces.com
or
http://www.bill-lewington.com/zottola.htm
or
http://users.rcn.com/rakright/
All the best---<Rick