As far as I can tell, they are both silver (look and sound) and from about 1918. One is a franc and the other is a 50 centimes. Has anyone seen anything like this? I'm guessing they were ground off. But why? Is it a possible error? They are a bit thinner than undamaged coins. I have a couple of each coin. That is how I can show both sides in one photo. Any thoughts? Thanks in advance.
If it is thinner than the other like coins, I think they were ground down. You would need to accurately weigh them to know the real answer, but I don't see how this could have happened at the mint.
I would agree that one side was sanded/ground down, but as noted weight would tell us for sure. The only way something like this could happen in the mint was if it was a full indentation strike...where 2 coins are fed into the chamber. One would receive only an obverse strike where the other would only receive a reverse strike. This is probably not what happened, though. Most likely PMD.
I got another one. This time it's a silver Australian Shilling. The other side is ground flat. A way to shave silver and still spend the coin? Not sure what the punched arrow is for. Odd.