It depends on what year it was struck, post new question
No mint mark indicates that the coin was minted in Philadelphia.
The mint mark is on the reverse of the coin between the tail and the D in the word dollar.
On this coin, the mint mark is located in between the two middle numbers of the date, and slightly above. If there is no mark in this location, the coin was minted a Philadelphia.
On a 1941 U.S. half dollar, the mint mark is located on the reverse side of the coin, just below the eagle's tail feathers. It will be positioned to the left or right of the ribbon that holds the olive branches. Depending on the mint where the coin was produced, the mint mark can be either a "D" for Denver, an "S" for San Francisco, or no mark at all for the Philadelphia mint.
The mint mark on a 1936 Walking Liberty half dollar is located on the reverse [tails] side of the coin in the little "valley" just to the left of the word "HALF" near the edge of the rim.
There is no "T" mint mark on any U.S. coin. Please post a new question with more details.
The mint mark for the 1909 Half Eagle is located on the reverse {eagle} side of the coin just to the left of the arrow points.
$6 to $15,000 depending upon the mint mark and the condition of the coin.
Need to know if mint mark is on the front or back of coin
$35 to $300,000 depending upon the mint mark and the condition of the coin.'
$1 to $3,600 depending upon the condition of the coin and the mint mark.
If the coin has one it would be just below Kennedy's neck on the obverse of the coin.