Is the second coin an example what I believe the ancient Romans called "damnatio" (I think)? Where the emperors image is defaced in dishonor?
The countermarked as is an as of Augustus minted in 7 BC by the money magistrate M. Salvius Otho. This man was the grandfather of the emperor Otho (who reigned for only 3 months in 69 AD). The countermark was not at all a damnatio memoriae : who would have wanted to erase the memory of Augustus ?!
Well done. They cleaned up very well. Well, I don't guess I've seen one of yours that didn't? I've not seen the second coin before. Doesn't mean anything, I'm no authority. Thanks for finding and sharing!