Seven of a Kind Serial Number
By Muhammad Khalid Hussain; published ; updated
A seven of a kind serial number has exactly seven matching digits and one different digit, as in 77717777. Banknote Expert checks all eight positions and overlapping patterns.
Enter your bill’s 8-digit serial number above to see its rarity score, any matched patterns and an estimated value range. Nothing is uploaded. The check runs entirely in your browser.
What is a seven of a kind serial number?
A Seven of a Kind serial has one digit appearing exactly seven times in its eight-digit string. The remaining position holds a different digit. In 55505555, seven digits are 5 and one is 0.
Seven of a Kind vs seven in a row, six and solid
Seven of a Kind counts matching digits wherever they occur. Seven in a Row adds a position rule: the seven matching digits must be consecutive, so the lone digit sits at the first or last position. A lone digit in the middle, as in 55505555, breaks the run but still meets Seven of a Kind. A solid has eight matching digits; Six of a Kind has six matching digits and two different others. Some sellers use near solid for either seven or six matching digits, so check the actual string.
| Pattern | Rule | Example |
|---|---|---|
| Seven of a Kind | Exactly seven matching digits; lone digit anywhere | 55505555 |
| Seven in a Row | Seven matching digits together at either end | 05555555 |
| Six of a Kind | Six matching digits and two different other digits | 66666678 |
| Solid | All eight digits match | 77777777 |
Seven of a Kind examples and non-examples
The examples preserve all eight digits. A seven-of-a-kind serial made from only two distinct digits is also a binary pattern; the illustrated 55505555 has that overlap.
| Serial | Result |
|---|---|
| 55505555 | Seven 5s and one 0 in the middle; binary seven of a kind |
| 05555555 | Seven in a row and Seven of a Kind |
| 55555550 | Seven in a row and Seven of a Kind |
| 77777777 | Solid, not exactly seven of a kind |
| 66666678 | Six of a Kind |
How rare is seven of a kind?
Choose the repeated digit in 10 ways, the lone-digit position in 8 ways and its different value in 9 ways. That gives 10 × 8 × 9 = 720 strings among 100,000,000, or about 1 in 138,889. The former hub display of 1 in 158,730 did not match the detector rule.
How much is a seven of a kind note worth?
The sold-price source has no publishable Seven of a Kind condition bands. The blank cells below reflect missing verified bands, not a zero value. A repeating-digit count by itself does not establish a premium.
Use the fancy serial number value guide to review condition and comparable sales, and the star note lookup to check star notes.
| Condition | Recorded range | Sample |
|---|---|---|
| Circulated | ||
| Very Fine | ||
| Uncirculated |
What raises or lowers the value?
- The lone digit's position changes whether the serial is also Seven in a Row.
- The repeated digit and arrangement may affect collector appeal, but this dataset does not price digit choices separately.
- A binary arrangement or a star note adds a distinct feature; no Seven of a Kind combination band is recorded.
- Denomination, grade and eye appeal affect the note's market. Compare like with like.
Should you keep, sell, or grade it?
Check the pattern overlaps and look for completed sales of comparable notes before deciding. Grading makes sense only when likely value and condition justify the fee, shipping and selling costs. Without a stronger feature or sale evidence, a circulated example may not justify grading.
How to check your serial
Count the repeated digit across the full eight-digit serial and confirm it appears seven times. Note whether the lone digit is at an end or in the middle, then check for binary and star-note overlaps.
Run the digits through the fancy serial number checker and compare the Solid guide and Six of a Kind guide.
Check your serial on Banknote Expert
Enter all eight digits, including leading zeros, to see Seven of a Kind and any overlapping patterns.
Open the fancy serial checkerSeven of a Kind serial number FAQs
What is a seven of a kind serial number?
An eight-digit serial with exactly seven copies of one digit and one different digit.
What is the difference between seven in a row and seven of a kind?
Seven of a Kind counts digits in any positions. Seven in a Row requires the seven matching digits to be consecutive at the start or end.
How rare is seven of a kind?
The detector's combinatorics give 720 qualifying strings among 100,000,000, or about 1 in 138,889.
Is seven of a kind worth more than six of a kind?
The pattern count alone does not determine price. No verified sold bands are recorded for these two categories here, so compare similar completed sales.
Should I get it graded?
Only when likely sale proceeds support the grading, shipping and selling costs for its condition and denomination.
What is a binary seven of a kind?
It is a seven-of-a-kind serial that uses exactly two distinct digits, such as 55505555.