I picked up this bike that was converted to a trike because it looked like a fun project. But, I can't seem to identify what the bike part is. Any ideas? There's no serial number, or badge on the front. On the seat tube, it looked like it may have said custom deluxe, and it looks like there may have been a shield with a plus sign. I'm not sure because it was painted over. The only marking is on the chain guard and the person I got it from thought that was an old phone number. Any ideas would be appreciated.