Bob,
That's it, that's the gun, but it was not cased at the time, like I said it was many years ago. I started going to the OH shows around 1965 so it could have very easily been in the mid to late 70's.
Someone did say who "may" have made it but it was so long ago that I don't remember, back then it didn't seem all that important, it will be interesting to see what the factory records say. I'll try an dig up some of my old records from the 70's, I may have written down something about it like the serial number etc. but of course you already know that. I'm sure you have had the grips off and looked for markings, have you had the sideplate off, there may be something marked there also.
H. M. Pope