I have this piece of envelop and think it is interesting. I do not know when it happened but defiantly before 1949. The stamp reads "free postage during sabotage".
Not sure if it directly relates to the OP, Just a guess, something to possibly go on? (keep you busy while you wait, sorta thing :) Who knows might help with something else down the road.
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Stamp Community assumes no liability for errors. Copyright 2005 - 2022 Stamp Community Family - All rights reserved worldwide. Use of any images or content on this website without prior written permission of Stamp Community or the original lender is strictly prohibited. Privacy Policy / Terms of UseAdvertise Here