I looked through the serial number page (and across the net) and am still having problems with identity. I just purchased a used Supraphonic at Guitar Center. I don't have it in front of me because it was a used item and is on a 2 week hold for a police check. Never heard of that, but it's okay. Maybe they should have just kept it off the shelf until it was okay to sell. It is a B/O badge with rounded corners and a serial number. This leads me to believe it is a late 70s model. The serial number starts with 3019xxx. It's also missing the muffler. Not really a problem either because I like to use a ring style muffler, but I'd like to fill the holes with what goes in them. There are 2 holes where it should go, but I have seen 2 different types of mufflers on Supraphonics - baseball bats and the round type. Any help would be greatly appreciated.