Mechanical Banks
Mechanical banks, which predated the plastic piggy banks we’re more familiar with today, used to hold spare change, but these days the banks themselves can earn you a good chunk of change. You can contact the Mechanical Bank Collectors of America have been searching for these since 1958. They can be worth up to $2500.
Upside Down Ball Mason Jars
Upside down mason jars from Ball were made between 1900 and 1910 and were often used as a coffee grinder dispenser. Since they were only made for 10 years, you can imagine that they’re pretty rare and that’s why some people are willing to pay about $1000 per jar.