No, and no. BUT... the 1954 is worth it's weight in silver, which today makes it worth $1.20. The six pence I have no idea about, but if it's silver, it too will be worth at least it's silver melt value. The 1975 No-S dime is a proof coin. Take a look at the difference between proof coins and 'business strike' coins (of which your dimes are). Keep looking, but don't get your hopes up too much for the 75 No-S (only 2 are known).
