I had a 1979 $5 that was in bad shape. I entered it on Where's Willy, and wrote the URL on the note. The first two places I tried to spend it wouldn't take it (teenage cashiers) but the third did (older cashier.)
Keep in mind the cashier's age. If she was 18, she's never seen a multicoloured note in circulation in living memory. And $1 notes went out of circulation before she was even born.
Makes you feel old, doesn't it?