Fancy Serial Numbers: Every Type Explained

• solid — Every digit in the 8-digit serial number is identical (prefix/suffix letters not counted). Example: 11111111.
• ladder — Digits ascend or descend by 1 in sequence. Ascending example: 01234567. Descending example: 98765432.
• radar — The 8-digit serial number reads the same forwards and backwards (a palindrome).
• repeater — A pattern repeats within the serial number; minimum repeat unit is 2 digits (e.g. 12121212), and a common sub-case is the first half equaling the second half (e.g. 74627462).
• super repeater — The first two digits repeat four times across the 8-digit serial. Example: 39393939.
• binary — The serial number contains only two unique digit values, in any order/quantity. Example: 74774774. PMG explicitly excludes numbers that are actually solids-in-disguise or round numbers like 10, 100, 1000, and 1 million from being counted as binaries.
• trinary — Like binary, but exactly three unique digit values appear across the 8-digit serial.
• low serial — Serial numbers starting with five or more zeros are treated as fancy 'low' serials, i.e. the numeric value falls in 00000001-00000999.
• high serial — Serial numbers starting with four or more nines are treated as fancy 'high' serials, i.e. numeric value in 99990000-99999999.
• birthday date — Serial number is interpretable as a calendar date of significance (personal or historical), e.g. 07041776 (July 4, 1776) or 02221732 (Feb 22, 1732, Washington's birthday).
• seven in a row — Seven of the eight digits in a row are identical. Example: 77777771.
• million — A serial number consisting of a number 1 through 100 followed by six zeros (e.g. 00001000000-style values scaled to 8 digits, i.e. 1-100 followed by six zeros).
• rotator — (Not requested in the brief but found alongside the others.) A serial number that reads as a valid number when the note/digits are rotated 180 degrees; only digits 0,1,6,8,9 can appear (6 and 9 swap under rotation).

Collectors of fancy numbers want crisp, uncirculated notes. A folded, worn note with a radar number is a curiosity, not a collectible, unless the pattern is exceptional. This page gives no prices.