The U.S. didn't mint any regular circulation half dollars dated 1926.
However, there were 2 commemorative coins issued that year. One honored the Oregon Trail, and the other was struck for the 150th anniversary of independence. There's more information at the Related Question links below.
what carrot is 1926 , 2.5 coin minted
The 1926 Peace dollar is very common and regardless of any mintmarks in circulated condition values are $24.00-$29.00
50$
A US half dollar with a date of 1979 is a Kennedy half dollar not a liberty half dollar. The coin has no silver and is only face value.
Please check your bill again. There were no 1926 US bills; the date is most likely 1928.If so, there's more information the at question "What is the value of a 1928 G US 2 dollar bill?".
It has a metal value of about $10.
Value is for the silver about $2.50
a half dollar
About $4-5
50 cents.
The US didn't strike any half dollars in 1804.
A U.S. half dollar dated 1953 or 1952 is a Franklin half dollar. If it shows any wear, the value is only for the silver, about $10.00. The coins are very common.