7 of a Kind Notes
Seven identical digits in a row — the second rarest "of a Kind" category, just one digit away from the legendary Solid.
A 7 of a Kind note contains seven identical digits in its 8-digit serial number, with one digit differing. For example: 11111121 (seven 1s, one 2). This makes it the second rarest category in the "of a Kind" hierarchy, trailing only the Solid (all 8 digits identical).
Rarity
For any given digit (say, "7"), the number of 8-digit serials with exactly 7 sevens is: choose 1 position for the non-7 digit (8 ways) × 9 possible non-7 digits = 72 possible serials per digit. With 10 possible repeated digits, there are 720 possible 7-of-a-Kind serials in any given print run of 100,000,000 notes — about 1 in 139,000. In practice, collectors consider these very rare.
Value
A 7 of a Kind note in circulated condition typically sells for $100–$500 depending on the denomination, the repeated digit, and overall condition. In uncirculated condition, examples can reach $500–$2,000. The most desirable examples feature a high-denomination note with the most common "eye candy" digits (like 7s or 8s) and a clearly prominent "different" digit.
How to Spot One
When checking serial numbers, look for a serial where the same digit appears seven times. The one "odd" digit can be anywhere in the sequence. A note like 77777177 is just as valid as 77777771. If the "odd" digit appears at position 4 (in the middle), some collectors consider these slightly more visually appealing as the interrupt is less obvious.
Authentication
Unlike some fancy serial categories (like errors), 7 of a Kind notes need no special authentication — the serial number speaks for itself. Simply count the digits. If seven are identical, you have a 7 of a Kind. For high-value examples, PMG or PCGS grading provides both authentication and condition certainty.
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More in Fancy Serials: Complete Guide
6 of a Kind Notes (Near Solids)
Six identical digits in an 8-digit serial — also called a "near solid," these are highly sought-after by collectors who can't find a true Solid.
5 of a Kind Notes
Five identical digits in an 8-digit serial — common enough to find in a lifetime of looking, rare enough to be worth keeping.
4 of a Kind Notes
Four identical digits in an 8-digit serial — a stepping-stone category that rewards habitual serial-number checkers.