Radar Notes

A radar note (also called a palindrome) is a currency note whose 8-digit serial number reads identically forward and backward. For example: 12344321 or 09911990.

What Makes a True Radar

For a serial number to qualify as a true radar, each digit position must mirror its opposite position:

• The 1st digit must equal the 8th digit
• The 2nd digit must equal the 7th digit
• The 3rd digit must equal the 6th digit
• The 4th digit must equal the 5th digit

Examples of true radars:

• 12344321
• 27288272
• 56344765 (No — pos 3 = 3 but pos 6 = 7; 3≠7, so this is not a radar)
• 11111111 (This is a solid, not a radar – more specific category)

Frequency and Rarity

Mathematically, a true radar occurs roughly once every 10,000 serial numbers. This means that in any given print run of 100 million notes (using the same prefix and suffix), you'd expect approximately 10,000 radar notes. While this sounds common, it's important to remember that most currency stays in circulation for many years, and finding a specific serial number in change is extremely unlikely.

Near-Radar Notes

Collectors also recognize near-radar notes, which have one digit out of position. For example, 12354321 (where the 5 and 3 are swapped) is considered a near-radar. These are more common but still collectible, typically commanding smaller premiums than true radars.

Collecting Radars

Radar notes have several advantages as a collecting category:

• Easy to verify visually – simply check if the number is the same backwards
• Consistent demand across collectors
• Attractive premium values, especially in uncirculated condition
• Recognized by PMG and PCGS grading services

Value Considerations

A radar note in circulated condition might command a $5-$25 premium above face value, depending on denomination and series year. Uncirculated radars of lower denominations can easily be worth $50-$200. Rare series years or high denomination radars can reach $500 or more. Professionally graded and encapsulated radars command significant market premiums.