I wished I knew because that is a nice bike, the rear tire is the same as on my late 90's Murray bicycle and the stem, handle bars are also from an 80 to mid 90's Murray but I don't know the frame.
Much better. I was having trouble making out some of the tubes before. Don't know what it is. Never seen one like it. Possibly home-made? If so, someone went to a lot of work.