Holy cow............what a list! I suspect that my records may be the oldest ones;though Boris Karloff, who really was a cultured, kind, very nice man, may have been the earliest version. Do you have any idea when he recorded it?
Not sure exactly when Boris made the recording, but it was sometime in the fifties. Children, of course, were his biggest audience at the time, since the old Universal horror flicks were being played on TV at the time, and this gave his biggest fans a chance to see the real Boris.
Here are some sites I found. The first is a list of some of Rathbone's recordings including sound clips of Peter and the Wolf. The entire site, by the way, is great, a comprehensive guide to everything Basil:
http://www.basilrathbone.net/recordings/page2.htm The second is a list of recordings of Peter and the Wolf, done by various artists over the years, listed on the official Prokofiev website. It doesn't list Clinton's version (Which I suggest should be renamed The Wolf Done Gone :-):
http://www.prokofiev.org/catalog/workessential.cfm?WorkID=80