Hi there,
I just bought this beautiful tangerine sparkle Gretsch round badge dixieland snaredrum. But it looks like the original internal muffler is missing. There are two little screws in the shell on the place where Gretsch mufflers used to be installed. But it should be having 3 holes: 2 for the screws and one for the muffler knob. Take a look at the pictures!