“Radar” banknotes feature palindromic serial numbers that read the same forward and backward, making them desirable to collectors and numerology fans.

Higher denomination bills with “radar” serial numbers are more valuable due to their rarity, as they are produced in smaller numbers.

Some collectors may seek bills with repeating “radar” serial numbers or “super radar” serial numbers, which can fetch high prices at auction.

U.S. banknotes with palindromic serial numbers have sold for over $1000 at auction, with some older examples fetching even higher prices.

While run-of-the-mill “radar” bills without special serial numbers sell for above face value, bills with unique sequences can command significantly higher prices.