Nice Find!
Well, now to follow that disciplinary post we just got blasted with above..... LOL
Nice find and addition to your collection with the Dial-A-Matic (D.A.M) as some call them.
I have a very limited knowledge of Dial-A-Matics other than knowing it was Hoover's first Clean Air (Bypass) design. There seems to be a love/ hate relationship for these. Some really love them and others want just about nothing to do with them. LOL.
It's quite possible over the past 50 -60 years of its life that the baseplate got replace or the font text got scratched off for the model number.