1964 Luxembourg 1 Franc!

Mmmm grease. We love it on bacon, fries, and coins. Before they're struck, that is. Afterwards it's just kind of gross. This coin obviously isn't in it's prime and it likely never was. Normally I would just pass this off as normal wear, but since it lacks the normal qualities of wear, I doubt it is.

These normal qualities include, but are not limited to; even wear, grime, tarnish, contact marks, etc. Sure there is some black-ish stuff on the obverse but it is not even. The wear is not even either as can be seen on the reverse with the flowers. I'm guessing there was some grease on the die when the coin was struck which caused it to look this way.

Now this may have just been a worn die which is possible or circulation wear which is less likely. These "errors" are pretty common and usually don't give any extra value than face value. Since this coin is demonetized It is worth around $0.10.