Could Your Old 'Harry Potter' Books Be Worth a Fortune? Here's How to Tell

You could have a valuable copy of Harry Potter on your bookshelf and not even realize it.

As we've seen multiple times before, people have gotten extremely lucky with their old Potter books that were just sitting around collecting dust. Most recently, as CNN reports, a rare first edition of Philosopher's Stone sold for £28,500 ($34,500) at an auction.

So, do you have one of these gold mine copies? Indy100 reports that Jill Gallone, head of media at Hansons Auctioneers, explained to CNN how folks can tell if their book is (even more) of a treasure. These are the six guidelines for Philosopher's Stone:

1. The word “philosopher” is spelled wrong on the back cover.

2. The phrase “1 wand” is repeated in a supply list on page 53.

3. Rowling is identified as “Joanne” rather than "J.K."

4. The publisher must be Bloomsbury.

5. The latest date on the copyright page must be 1997.

6. The print line on the page must read: “10 9 8 7 6 5 4 3 2 1.”

Sadly, these first editions are extremely rare, as most copies reportedly went first to schools and libraries. But if you are a lucky Potterhead with one, head to your nearest auction house. You are about to make serious dough!