Serial numbers that contain only two different digits (e.g., 10101010) are also highly prized by collectors.
Notes with repeating sequences (e.g., 12341234) or patterns (e.g., 5555 5555) are rare and valuable.
Bills with serial numbers like 00000001 or other low numbers are highly sought after by collectors and can fetch high prices.
These are replacement notes marked with a star next to the serial number. Limited in production, they can be more valuable, especially if they are in excellent condition or have low serial numbers.
Bills with printing errors, such as misaligned seals, missing elements, or ink smudges, are rare and can be worth thousands.
Serial numbers that are palindromic (e.g., 12344321), have special dates (e.g., 07041776 for July 4, 1776), or are known as "fancy" numbers can be very valuable.
Bills from significant periods or with historical annotations can have increased value, especially if they are in good condition.