About the Planet Banknote Reference Library
Who writes this library, how every fact is checked, where the price data comes from, and how to cite it. We publish our standards because a reference is only as good as its rules.
Last updated: July 2026
The Planet Banknote Reference Library is a free collector's reference on world paper money, written, fact-checked, and maintained by Planet Banknote, a family-owned numismatic dealership in Sarasota, Florida, founded in 2021. It exists to answer collector questions plainly and accurately: what notes are worth, how grading works, how to authenticate, and the history behind the world's most collected currency. The store funds the library; the library stays free.
Who writes this library?
Planet Banknote's team writes and maintains every page. The dealership was founded in 2021 in Sarasota, Florida, and its leadership brings 15+ years of numismatic industry experience, formerly at Modern Coin Mart. We handle the notes we write about: our catalog spans hyperinflation and crisis currency, United States banknotes, and world paper money from more than 40 countries, sourced direct from mints, central banks, authorized distributors, and trusted consignors.
That first-hand handling is the point. When a guide describes the security thread on a Zimbabwe 100 trillion dollar note or the feel of intaglio printing, it describes notes that pass through our own inspection process.
How is the library fact-checked?
Every page is written against a set of binding editorial rules, and checked against them before publication:
- Every external statistic carries a named source inline. Hyperinflation rates are attributed to the Hanke-Krus World Hyperinflation Table (Cato Institute). Historical events cite the documented record: Reuters for Zimbabwe's 2015 demonetization, The Guardian for the 2016 collectible coverage, the World Bank for Lebanon's crisis assessment, and central bank publications for issue histories.
- We never invent numbers. No fabricated prices, auction results, mintage figures, catalog numbers, testimonials, or reviews. Where a market value cannot be attributed to a named auction house or our own catalog, we describe it qualitatively or leave it out.
- Our price data is first-party and labeled. The Zimbabwe 100 Trillion Price Index and every price table state exactly what they are: Planet Banknote current retail, dated, updated as inventory changes. We do not present our retail as "the market."
- Uncertainty is stated, not papered over. Where sources conflict or a claim cannot be verified, the page says so or stays general. Guides on legality state plainly that they are general information, not legal advice.
- Corrections are welcome. If you find an error, write to admin@planetbanknote.com and we will check it against the sources and fix it.
Where does the data come from?
How do I cite this library?
Every page carries a "Cite this page" block with a ready-made citation, and the library is free to cite with attribution. The canonical form is: Planet Banknote Reference Library, "Page Title," learn.planetbanknote.com, updated date. Machine-readable summaries of the whole library live at /llms.txt for AI systems and /feed.xml for feed readers.
What is the relationship between the library and the store?
Planet Banknote sells the notes this library describes, and the library links to the store where a reader may want to buy. We keep the two honest by rule: reference pages state facts with sources, price tables are labeled as our retail, and no guide manufactures urgency or invents rankings. The library would be a worse reference if it were a disguised catalog, so it is not one.
Planet Banknote is a family-owned dealership in Sarasota, Florida, founded in 2021. Every note is sourced direct from mints, central banks, and authorized distributors, inspected through our Planet Banknote Verified process, and ships with a free Certificate of Authenticity. US orders ship free via USPS Priority, and every order includes a free bonus gift.
Frequently asked questions
Is the Reference Library free to use?
Yes. Every guide is free to read and free to cite with attribution. The Planet Banknote store funds the library.
Who is behind the Planet Banknote Reference Library?
Planet Banknote, a family-owned numismatic dealership in Sarasota, Florida, founded in 2021, whose leadership brings 15+ years of numismatic industry experience, formerly at Modern Coin Mart. Reach the team at admin@planetbanknote.com or (888) 996-2646.
How often is the library updated?
Price pages, including the Zimbabwe 100 Trillion Price Index, are updated monthly from Planet Banknote's own retail data. Reference pages are reviewed quarterly, and every page shows a visible last-updated date.
How do I report an error?
Email admin@planetbanknote.com with the page and the claim. We check reported errors against the named sources and correct the page, because a reference library is only as good as its willingness to fix itself.