Where I live, there is a huge flea market every Sunday that has many with various backgrounds selling, for the most part junk. However occasionally, a treasure unknown to the seller is discovered. This has happened to me twice:
First time was a small medicine bottle with the original manaufacturer's label on it that was over 100 years old. That in itself is quite a find, but what made this more unique is that the name of the medication on the label was, 'morophine'. For those of you who don't know, Morophine was sold in any drug store freely, as if one were buying shampoo. I bought it for one dollar. It is worth hundreds of dollars.
The last occasion was when I purchased a hardcover book that was also over 100 years old. What made this book rare is that it was the program schedule for the meeting of the Knights Templar in St. Louis, and the book, like the medicine bottle, is in perfect condition.
Bought it for a buck, and it also is worth hundreds. For those of you who don't know, the Knights Templar were servants to the Pope, and soldiers for him, during the crusades. The group was supposed to have been destroyed in the 14th century.
Knowledge is power in many ways.