These were minted in France from 1853-1857 from 5g of Bronze. The W under the bird on the reverse it the mint mark for Lille. Value is around $1. Nice coin.
This one at least is real. Some of the stuff you've posted this morning (1757 peace medal, etc) has been fake. This one got well worn, but they often did. They are typically encountered in lower grade like this. It says DIX (for "ten"), not FIX, but autocorrect probably made you type "Fix", huh? (My tablet's autocorrect loves to "help" me with stuff like that. Grrr.) Here is the NGC/Krause data. Your coin grades around AG3, so as such, this is the sort of coin I used to sell in my 3/$1 bin when I was a small dealer. Nevertheless, it is a historical coin over 160 years old, so even when those aren't worth much (as is the case here), they still are appealing. Plus, there's the largish size, the handsome portrait of Napoleon III, and that great eagle holding thunderbolts. You've gotta like that.
BTW, here is what a Mint State example of the type looks like. (Not my coin, but I've had some.) Nice looking design, huh?
Ye could find these in the junk boxes here in Ken-Tuk-Ay a few years ago... as well as a few "L'an". One speculates [with just one URL ever seen for corroboration] that... "hard money" is Hard Money... ...and indeed these Nappy-Threes may well have been circulated hereabouts... especially when loose change got scarce... ...during the War of Northern Aggression.
I've never heard the term, "Nappy Threes" before, but is a great slang term. I'm sure they circulated here before 1857, and probably for a while after the Civil War.
If I may, it was actually 10 grams for the 10 centimes and 5 grams for the 5 centimes and guess what ! 2 grams for the 2 cts and 1 gram for the 1 ct Q