Used examples of the 12 1/2c Message-Reply card are scarce, seldom appear on the market, and command high prices. But be careful. Here the Luxembourg-Ville V double-circle cancel was backdated to 3 July 1879, making this 12 1/2c Message card appear to have been postally used to Metz. But the double circle cancel did not come into use until 1883! So obviously this is a backdated cancel.
The absence of a receiving mark is another clue that this is a bogus use of the 12 1/2c card.
The card comes from an old German worldwide postal stationery accumulation of about 4000 cards, which were collected before WW1 and stored away until a few years ago. So the fakery occurred long ago.
Let me know if you have seen other backdated uses of the Luxembourg-Ville V cancel, or any other cancels.
Thanks to Luxembourg’s outstanding proofer, Lars Boettger, for alerting me to the bogus status of this usage!