1. Did all Slingerland drums in the mid-late 1960s have the year stamped on the inside?
2. I found out at Cymbalholic.com that some toms were made with NO air vent. Thus maybe the reason my 12" had an aftermarket hole installed and badge attached (i.e. its really high and not in the middle of the drum)
3. So inside my tom tom all I have is a big P. When I bought it off ebay the sellers description was "1960s Slingerland 12x8" It was finished in Red Tiger pearl.
Here is a photo of the inside of the shell.