KN is the mint mark on coins made by the King's Norton Metal Company under contract from the British Royal Mint.
Where the date is, the mint letters are on left in corner (where the curve of the edge meets the line above date section) - though most coins do not have the marks. There is also H letter sometimes. Both are in Birmingham, England. H = Heaton, KN = King's Norton.
The mint mark is below the date.
No - there are three types ... 392,021,000 with no mint mark 57,154,000 with D mint mark 57,154,000 with S mint mark for 1919 USA 1 Cent. The mint mark (if present) is below the date.
No mint mark means it was minted in Philadelphia.
The mint mark is located on the reverse [tails] side of the coin at the bottom below the wreath. If there is no mint mark then the coin was minted at the Philadelphia Mint.
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
There is not always a mint mark on coins. If your coin does not have a mintmark it means that it was made at the Philadelphia mint in Pennsylvania.
A mint mark tells where the coin was minted, for example, a P mint mark (or in some cases no mint mark) signifies the coin was minted in Philadelphia, D is for Denver, S is for San Fransisco. I'm assuming someone told you that the mint mark was under the eagle for whatever coin you had, so you simply need to look under the eagle to find a mint mark. Keep in mind that some coins were produced in the Philadelphia mint and have no mint mark.
If you are referring to UK pennies, then most have no mint mark as they are produced at the Royal Mint. However, mint marks since the 1870's are either an H under the date or an H or KN to the left of the date. However, I suspect you might be referring to US cents. In this case you will find the mintmark under the date, unless it is the Philadelphia Mint which does not place mint marks on cents, although "P" has appeared on all other denominations since 1980.
The mint mark of the Denver Mint (shown as a "D") and the San Francisco Mint (shown as "S) on the Eisenhower Dollar is located on the obverse (heads) side of the coin directly beneath the bust of Eisenhower. If there is no mint mark there, then the coin was struck at the Philadelphia Mint and in this mint did not place a mint mark on the coins struck there until 1979.
The 1918 British Penny was minted in London in 1918. Those with a "KN" Mint mark were minted at the King's Norton Metal Co., those with an "H" Mint mark were minted at the Heaton Mint, Birmingham. The reverse features a seated figure of Britannia with trident and shield. They were made from bronze, were 30.8 mmm in diameter and weighed 9.54 grams. The same design was used from 1911 to 1926.
There is no mint mark on the 1921 Peace dollar because they were all minted in Philadelphia and thus carry no mint mark.