Is your Filter Queen a Canadian-Made model? In the US, that model would have come with a felt pad and no bare floor tool. There would have been a peg on the attachment crown, with an adapter, to hold the felt pad for the Power Nozzle. The bare floor tool was an optional attachment at the time, but the curved adapter would have had a tan rubber wand end, not a brown one.
The first Filter Queen to have the heat shield (the grill on top of the machine, which kept the user's hand away from the hot metal dome - made very warm from the motor's exhaust heat) was the 1978, 50th Anniversary Model.