This design (by gaston Lavrillier) was also used in medal form (with ribbon and suspension) by the town of Chateau -Thierry in 1920 to celebrate the efforts of French and American soldiers who had fought in that vicinity. There are variants. I have seen the exact same item with an `A' on the reverse inder the date (usually associated with Paris Mint). This one has a `D' (usually associated with Lyon mint). Given that the item was indeed made in Paris, i'm struggling to find the significance between the use of the two letters on this occasion.
This particular medalet is brass but with an unusually good silver plating.
