The third coin 1798 Mo FM is quite likely a Class 2 Silver Contemporary Circulating Counterfeit based on the clues I wrote about in my book. It would sell at par with a genuine coin (since very few people recognize them and a positive test costs more than the coin is worth).
The others all look genuine to me. The second coin the 1821 Zs appears to have lost weight due to edge filing. The 1863 Pi appears to have something wrong on the reverse at top dead center.
There are no other issues that I see.