Unveiling the World's Most Valuable Collectors' Items

40. Salesman Sample Calendars (Original Price: $5-$15* Worth Today: $10-$400*)

Back in the day, there were plenty of Salesman Sample calendars featuring all sorts of nostalgic scenes. From policemen marching with bands to heartwarming moments of mothers with their children, these wall calendars took you back in time. And guess what? You can still find them online, selling for a reasonable price of $10 to $50.

Now, there are a few exceptional ones that stand out from the crowd. Take, for example, the NOS Salesman Sample Framed Calendar from 1956, currently listed on eBay for a whopping $400. If you're aiming to make some serious cash, your best bet is to look for calendars from the 1950s or earlier, especially those showcasing artwork by renowned artists like Philip R. Goodwin. And here's a little tip: if you sell it already framed, you can ask for an even higher price.