I found a few closed gunbroker auctions on an Imperial Metal model 7, but not on a 101. It has already been mentioned but the ones that I have found looked like the RG-10, except they looked nicer. Unfortunantly, information on this company not widely known on the internet. I can look when I get home, but who knows...
If you have the overpowering urge to shoot it at least take it to a gunsmith first and make sure it can handle being worked. That being said; I suggest firing .22 CB loads through it, and nothing hotter.
I know it bugs meto have a gun that I just plan ol' can't shoot. Just so long as it hasn't been worn out, it should be able to shoot a few.
Have fun, and post pics if possible.