Here's a great cover from the Polish Hyperinflation period of 1923/24. This cover is franked with a 1 Million Mark stamp which is quite scarce to find properly used on cover. In addition this cover was sent just before the currency revaluation which took place on 5/1/24. It was then returned to the sender AFTER the currency revaluation so a nice "bridge" cover from before and after the revaluation.

