Oh right, there were 5F and 10F silver pieces struck by the French in the 1960's. The "sower" is a nice coin too but the Hercules is, in my personal opinion, more interesting. And yes, you're right, the 5F piece has the then-normal French "coin silver" composition of .835 fine. There was a time when France would make the "sower" in 50 Centimes denom. and up. Pretty cool coins too.
P.S. Apparently in 1864 all silver coins of France except the 5 franc piece were debased from 90% to 83.5% silver without the weights changing.
It was an interesting example of debasement looking at coins just a few years difference changing only composition around WWII. Like our steel cents. some coins minted under German occupation look very plain. My neck hurts from staring at coins last night, lol
If the 5F silver pieces are about VF/XF in terms of grade, i.e. average circulated, then they are probably worth $7-8 apiece. If they are super shiny and uncirculated then probably more. Unfortunately, those coins don't move very well. Mintages were insane (some years over 40 million!) so they are considered very common.
If you need help with your foreign coins feel free to send me a PM.
I will get some pics! Funny some coins I could not read because of the wear, but take a picture with a modern cell phone and the date is legible.
thankfully my sister is realistic about the value. I’ve showed a lot of sold items on eBay and factor in the sell costs/risks to get an idea of what to expect.
Thank you for the offer of help and I will be sure to get some pictures this evening. It’s not a large collection, maybe 2 thousand mainly in metal value, but fun to see some European coins I’d never hold otherwise.