US mint sets were not made till 1936. Check the dates again.
1 dollar
$20
The US did not mint a dollar coin in 1968, therefore you don't have a 1968-D silver dollar.
The U.S. didn't mint any silver dollars in the 1940s.
A typical Mint State coin is about $50.00
The Carson City Mint opend in 1869
as much as you can get for it.
The U.S. didn't mint any silver dollars in 1946.
There were no silver dollars issued by the US Mint in 1964.
A 1884 Silver Dollar - aka - Morgan Dollar - is worth in good condition (G4): $18; if its mint state is MS60, the value rises to: $40.
It is worth about $10 in good condition and about $20 in mint condition.
A 1901-S Silver Dollar - aka - Morgan Dollar - is worth in a mint state of AU50: $225.00.