I have a 9x13 Slingerland tom. It has 6 lugs on top/bottom. It appears to be mahogany. My questions: there are (3) holes near the top that appear to be for the muffler. These holes are horizontal, not vertical (like most 2 hole mufflers). Inside is stamped P-040, nothing else. No badge, no vent hole. does this muffler have (2) felt "rounds", or one? like most other later Slingerlands I've seen. Also, does anyone suppose this may be from the 50s as opposed to the 60s, as I always assumed. Does anyone know what year they started using the horizontal muffler (bracket), and what year they went to the vertical (bracket). Thanks so much for any insight...
Blessings!