"Inverted Jenny"

I said I was going to take a break but this is just too incredible not to mention.
This 24 cent stamp was attached to an envelope holding a Florida absentee ballot and was received in Ft. Lauderdale.
There was no return address, so the ballot was invalid.
The 1918 U.S. Inverted Jenny 24 cent air-mail stamp is estimated
to be worth $500,000.00!!!
Good ole U.S.A., where a stamp never expires, it just increases in value.
Here, stamps expire like stock options, if not used in a specified time, they are worthless. That's Costa Rica.