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| Mail from soldiers in the field has been traditionally "free", although special Feldpost stamps have been issued by countries including Germany. Is this a Feldpost stamp tied to the back of a picture postcard, or is it only an informational label serendipitously tied to the card? |
It's a sticker to emphasize that the card be handled without postage due (free mail). Several
other types exist; scans below sent by [Michael McMorrow]![]() |