RareBillLadder serial number
The digits climb or fall one step at a time, all the way across: 12345678 or 87654321. Just three serials run all the way up and three all the way down, which is what makes a true full ladder so hard to find.
How rare is it? Exactly 6 of the 100,000,000 possible eight-digit serial numbers are ladders — about 1 in 16,666,667. That figure is counted, not estimated: every possible serial was run through the same engine the RareBill app uses.
How to spot one
Read the digits aloud. If each is exactly one more — or one less — than the one before, with no repeats and no jumps, it is a ladder.
Example: 12345678 —
check this one in the lookup.
What it is worth
A full ladder is among the most valuable serials there is. Partial ladders (12345677) are far more common and worth much less.
Condition matters as much as the pattern. A crisp uncirculated note can be worth many times the same serial in worn condition, which is why RareBill shows value ranges with links to current listings rather than a single number.
Where it sits
Among the sixteen patterns RareBill checks, ladders rank #1 by scarcity.
Check a serial now
Type any serial into the free lookup and it will tell you every pattern it matches, instantly, in your browser.