With only four known examples in Fr. 1191, the 1882 gold certificate is an ultra-rare 50-dollar bill collectors covet. One in perfect condition with crisp details and clean printing sold for $299,000 ...
but some rare 20-dollar bills can actually be worth a lot. Knowing what to look for can help you spot a bill that's special (and could be worth more than your car). From the serial numbers to watch ...