I bought brand new a Top hat set in Blue Glass Glitter in early 1965 the dogbone double tom holder uses the same size hole as a tom mount the later Tpost style of double tom holder has a larger hole and a metal backing plate on the inside of the bass drum the dogbone has no metal backing plate one of the signs of a top hat was the addition of a Knobby mount high on the 16x16 this was factory on mine and another set Bobby Chiasson had, and I agree it appears there was never any side mount for a tom... I would love to see inside pics as well... and it was not uncommon for early Dayton sets to have a cleveland tag as they were using up the last of the Cleveland stock of shells but the numbers should be close , Ploughman is the man on the numbers game..
notice the high knobby the set came this way from the factory..
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