If it's larger than about 1 mm it's almost certainly something that was added after the coin was minted. If it's very tiny you may be seeing something other than an H, maybe the designer's monogram.
If the H is large your dollar is technically an altered coin, which reduces its collector value significantly. In that case it would be worth something only for its silver content, about $10 as of 11/2008.
There was no US silver dollar minted in 1950. If you mean a half dollar, it would be worth at least its value in silver which as of writing is about $7.70 but it would be worth more in better condition. As with all old coins, cleaning harms the value.
It means it was made at the San Francisco mint.
I assume you mean a silver certificate, not a dollar coin. Values range from $6 if worn, up to about $35 in near-new condition.
If you mean a 1880 Carson City Morgan dollar? circulated examples run from $100.00-$300.00
If you mean a 1900 Morgan silver dollar, circulated coins are valued from $32.00-$39.00.
it is pure silver
It means that somebody defaced the coin, and will reduce the coin's collector value. Dan
When silver jewelry is stamped 80 SR it means that the jewelry is 80% silver.
if the number .925 is stamped on it also that means sterling silver if the number .999 is stamped on the ring that means it is pure silver if no numbers, i am not sure
Carson City mint.
The I S stands for International Silver Company Meriden, Connecticut.
Nickel Silver
in a triangle "IRH"
Sterling stamped on any item is .925 silver and .075 other base metal.
It is the silver content in the ring. 988 is 98.8% silver.
do not touch
means its true silver?