Marion, thank you so much for doing this. I am amazed that it is possible. The main thing is that I now have printed music so that my sons can play the tune with me. And then you have it out here where everyone can see it and maybe someone will track it down.
Before I go any further, let me request it no longer be called "Rex's Mystery Jig" but rather as I have always known it: "Mike Powers' Jig". I learned this tune from a scotsman named Lloyd Weddell back in Luckey Ohio. It was he that first showed me how to play the fiddle. Not to mention, how to blacksmith, build log cabins, carve wood. He gave my life a whole new direction for which I am most grateful. Well he would play this tune and didn't know the name except that it was "an old scottish jig" that he learned from another Scotsman in town named Mike Powers. Mike was unique among fiddlers as a result of an accident with a stave cutter that made all his fingers the same length. Just straight all the way across. Even so he was quite a fiddler.
I go back to Ohio now and then and visit Lloyd's grave. I have said that should I learn the real name for this tune, I will go to Lloyd's grave and play it and then tell him the name of the tune. I am really grateful for everyone's efforts here. Particularly Marion. So you think it's a Morris tune? Interesting!

Rex