The US did not mint a dollar coin in 1968, therefore you don't have a 1968-D silver dollar.
The US has never made a gold half dollar.
A US liberty 1936 half dollar is worth half a dollar in 1936. It is now worth around $15 to $50 or more in 2013. The variation depends on the coin's condition.
The '64 Kennedy half is currently worth about $12.
No US silver dollars were made after 1935, look at the back of the coin for 'Half Dollar'.
A 1941 US half dollar in good condition is worth about $9. If it is in uncirculated condition, it would be worth about $26 to $40.
It's simply called a half dollar.
1976D Kennedy Half Dollar (Bicentennial) in uncirculated condition is worth $1.25. Circulated, it's worth 50 cents.
The US half dollar dated 1972 has Kennedy's bust on it not Eisenhower. It's worth 50 cents
The value of a US 1964 half dollar in circulated condition is around $10. in uncirculated condition they are worth around $16.
In 2007, one Jamaican Dollar was worth about one and a half cents in US Dollars. It is now worth about 1.2 cents.
You have a Franklin half dollar - a 1957 proof coin is worth around $25.00.
A US Kennedy half dollar dated 1969 is only 40% silver with a value of about $2.00.
If the coin is a US Kennedy half dollar dated 1974 it has no silver in it and is face value.
No US coin, including the half dollar has a crown stamp on it when it comes from the mint. Instead, if you have a US half dollar with a crown stamp in it, it was done either by a private company or individual. These stamps generally add no value to your coin and it is just worth what a damaged example of whatever year of half dollar you have is worth.
All US half dollars from 1964 to date have Kennedy on them, your 1995 half dollar is face value.
Not all that much. Most of the value in it comes from the 40% silver half dollar it contains, worth about $5 in silver. So the set is worth about $5-7 or so.
depends on who you stole it from
Face value only! 50 cents
At present, it's worth a little over $10.
As of February 2018, it's worth about $2.50 for the silver.
The 1986 Kennedy half dollar contains no silver and is still found in circulation, just spend it.
Better check your dates again. The only U.S. half dollar with a 1922 date is a Grant Memorial Commemorative. In circulated condition, it's worth about $60. If you have the variety with the extra star, then about $450
A 1969 half dollar is 40% silver. It is a common date only worth melt. At the time of writing it is worth about $3.50 in silver scrap.
There was no silver dollar in the US made in 1957. It might be a half dollar. These are usually worth about $10-15.