1840 1000$ Bill

Your "pro" wouldn't even make a good amateur. Even if the serial number 8894 should be all anyone needs to know, there are two major telltale signs.

With extremely rare exceptions, notes are printed on rag paper for flexibility and durability. That fake parchment crispy paper would last about two foldings before falling apart.

Most old currency was hand signed and numbered. Pen ink deteriorates, printing ink doesn't. Oddly enough, used genuine bills are easy to spot because the signatures and serial numbers fade to browns and reds, and heavy areas of pen ink often eat through the bill. Nice even black ink is a dead giveaway that everything was printed at once.