I didn't doubt the story. I think in a good auction you will get the $5,000 (not including commish). Because a genuine bill of this error type rarely shows up and there are some collectors that will need it for their collection. if 2 diff bidders really want it, then you get the perfect storm.
Moms are awesome! Super smart too! Thank you for sharing the unique find and story behind it, best of luck at the auction!!
Another update for those who are interested... My Mom's $50 is now open for bidding. https://currency.ha.com/c/search-re...9+4294966861&type=friend-consignorlive-notice