When I saw the hint, I thought it was either referencing Bill Monroe or James Monroe James Monroe was featured on $1 coins and on the $100 bill for a brief period in the 1800s. I thought maybe the Monroe reference meant the show with the MJM had an Uncle Pen, which that 8/21 show ironically does. Score for Pauly and I can't imagine RabeldyNugs didn't know this one straight away.

The funny thing is that source can sometimes give a pivotal hint if you have the same one in your collection or can throw you off too. I did a search for SBD sources in 93 but I only have a decent AUD of the 8/21/93 show.