You cannot drop an app database at a garage sale to prove to a seller that their "$5 box of junk" is actually $200 worth of rare castle parts. You can, however, print the relevant page of your and show them.
This section is the holy grail for vintage collectors. It covers the origins of the system: the knights, the Native Americans, and the construction workers. A good PDF guide will highlight the variations in these early figures, such as the transition from "fixed" hands to "gripping" hands, a detail that drastically affects market value.
