In my collection of Grand Duke Adolphe postal stationery is this curiosity -- the 10c reply card from the first G.D. Adolphe message-reply card issue used from the resort town of Ragaz, Switzerland, to Hamburg, Germany, May 31, 1900. The oval chop is that of the Hotel National Restauration S. Banz in Ragaz. There are three June 2nd Hamburg receiving cancels.
Of course under UPU regulations, the 10c Luxembourg stamp imprint was only valid for return postage to Luxembourg, but the card was not taxed. The poorly struck rectangular auxiliary mark seems to concern finding the delivery address in Hamburg, although I'm unsure of its significance. Comments?
Second 5c G.D. Adolphe Reply Card used
Sometimes lightening strikes twice.
After posting the unusual use of the 10c Luxembourg reply card shown above, I discovered the card shown below in the bourse of the fine Exposition Philatélique Internationale 'MonacoPhil 2009,' held in the Principality from December 4th to 6th.
The 5c Luxembourg reply card was posted from Leipzig, Germany, May 26, 1904, to Trier, Germany (just a few kilometers from the Luxembourg border), where it was received the next day. No penalty was charged for use within Germany, perhaps because the Luxembourg-German treaty rate in 1904 was five centimes.
I would like to find a citation to the UPU rule that provided that reply cards could only be returned to their country of origin. Who can help? Even better would be an example taxed for return to a country other than that of origin. But would the rule even apply to cards used in a country that had a treaty rate with the country of origin? Here the blue underscoring of 'Réponse. - Antwort' and the stamp in blue crayon suggests that the German postal clerk was aware of and accepted the use of the Luxembourg reply card within Germany.