That's AFFECT, not EFFECT. EFFECT is normally a noun.
The mint mark on ANY coin may affect its value because it lets collectors know where the coin was minted, and thus indirectly how rare it is. In most cases up to about 1940, fewer coins were made at branch mints than at Philadelphia, so they tend to be worth more. For example, in 1909 14 million Indian head cents were made at Philadelphia but only about 300,000 were struck at San Francisco, so the latter are worth far more.
An uncirculated Philadelphia half from 1972 retails for about $1.
$22 to $75,000 depending upon the mint mark and the condition of the coin.
Assuming the coin has no mint mark and is circulated, average retail value is $8.00-$10.00 for most coins.
More information is needed. What date? What mint mark? How worn is it? Please post a new question with those details.
a pfennig to a mark is a cent to a dollar~ in a mark, it is 100 pfennig~
Price ranges from about $20 (lots of wear) to $200 (almost new). However it can't have a P mint mark. The P mint mark first appeared on half dollars in 1980.
The mint mark on a Barber Half Dollar is located on the reverse side right under the tail of the eagle.
The first Half dollar with any mint mark was from the New Orleans Mint in 1838.The mint mark is on the reverse under the eagle
The 1920 Half Dollar - aka - Liberty Walking - mint mark of "D" or "S" would be located on the reverse side, just to the left and above the "H" in half dollar.
The mint mark is on the reverse of the coin between the tail and the D in the word dollar.
An uncirculated Philadelphia half from 1972 retails for about $1.
No mint mark indicates that the coin was minted in Philadelphia.
Half a dollar Depends on the mint mark - if it has an "S" and is in its original packaging it might sell for a couple of dollars.
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.
The mint mark on Franklin half dollars is on the reverse side, just above the Liberty Bell.
Hammer and sickle
This would be a Liberty Seated half dollar. The mintmark, if it has one, would be locted on the back below the eagle.