Solid Serial Number
Checker & Value Guide
A Solid is every collector's dream — 77777777, 88888888. Only 1 in 11 million notes. Check if you're holding one.
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What Makes a Solid Serial Number So Valuable?
A Solid serial number is a banknote where all eight digits are the same — like 11111111, 55555555, or 88888888. It is mathematically the rarest fancy pattern and commands the highest premiums in the currency collecting hobby.
Solid Serial Number Value by Digit (2025)
| Digit | Circulated ($1) | Uncirculated ($1) | Why |
|---|---|---|---|
| 88888888 | $1,500 – $2,500 | $3,000 – $5,000+ | Lucky 8 (Asian markets) |
| 77777777 | $1,200 – $2,000 | $2,500 – $4,000 | Classic "lucky" number |
| 11111111 – 66666666 | $800 – $1,500 | $1,500 – $3,000 | Standard Solid premium |
| 99999999 | $1,000 – $1,800 | $2,000 – $3,500 | Highest possible digit |
Values scale up roughly 2–5× on higher denominations ($20, $50, $100). A Solid on a Star Note can double these figures again.
Near-Solid Numbers
A Near-Solid (also called "Quasi-Solid") has one off digit — like 77707777 or 88888881. These are still highly collectible and typically sell for $100–$400 on a $1 bill. Our checker flags these automatically.
💡 If You Find a Solid, Do This First
- Do not spend it — take it out of circulation immediately.
- Place it in a rigid currency sleeve (Mylar D is best).
- Get it graded by PMG or PCGS Currency — graded notes sell for 2–3× raw values.
- List on Heritage Auctions or eBay with high-resolution photos of front, back, and close-ups of the serial number.
Related patterns
Frequently Asked Questions
Everything you need to know about collecting fancy serial numbers.
What is a Solid serial number?
A Solid serial number is one where every digit is identical — for example 77777777 or 22222222. Solids are widely considered the 'Holy Grail' of fancy serial numbers because they are the rarest pattern collectors hunt for in circulation.
How much is a Solid serial number bill worth?
Solid serial number bills typically sell for $500 to $3,000 in circulated condition and $2,000 to $5,000+ uncirculated. The exact value depends on the denomination, condition, and specific digit — 8s (considered lucky) often sell for the most, while 0s are impossible (serial numbers can't start with 0 across all positions).
Which digit is the most valuable in a Solid?
Solid 8s (88888888) are typically the most sought-after in Asian collector markets because 8 symbolizes prosperity. Solid 7s (77777777) are popular in Western markets for luck. Other digits (1s, 2s, 3s, 5s, 6s, 9s) are roughly equal in value, while solid 4s are slightly less desirable in some markets.
How rare is a Solid serial number?
Extremely rare. There are only 9 possible solid serial numbers per 100,000,000 — roughly 1 in 11 million notes. For comparison, Radars appear about 1 in 1,000. If you find a Solid in circulation, do not spend it.
Can a Solid be combined with a Star Note?
Yes, and those are exceptionally rare. A Solid Star Note (e.g., 77777777*) can sell for $3,000 to $10,000+ depending on run size and condition. If you find one, get it graded by PMG before selling.
How do I sell a Solid serial number bill?
For bills under $500 estimated value, eBay (with clear photos) works well. For bills valued over $500, use specialized currency auction houses like Heritage Auctions or Stack's Bowers, and consider getting the note professionally graded by PMG or PCGS Currency to maximize the sale price.
Have a specific question not answered here? Check our detailed Value Guide above.