Today I went to the local Simplicity dealership to get a part for my Acgo Allis 918H. While I was there I was talking to the one of the owners about the older Simplicity's, AC's and other brands too. He said "hold on one second" and came back with this old brochure and gave it to me. He told me that they had recently found a few of them while cleaning.
It just so happens that this is the same dealership where my 918H was sold new. I gave him the serial number from the tractor and tomorrow is going to give me a call. He said he would tell me the day the tractor was sold and even the name of the original owner too.