Do you know what kind of Sonor that is? Looks like Sonor Signature, if so, those are some mighty fine drums and you should get some new heads for them.
Edit: Nevermind, I didn't see you have already said it above. Confirmed, is the rest of the kit (bass and two toms) also sonor signature?
I don't know, on the badge is only Sonor Est. 1875 writes...i found on internet that drums with this looking badge are from 1980's...nothing else writes on them...snare drum is Sonor Signature ...