Walking Liberty Half Dollars will never have a "W" mintmark. Instead, that is the designer's signature. If your Walking Liberty Half Dollar has a mintmark, it will be on the left side of the coin near the branch that the Eagle is perched upon. 1942 was a common year of Walking Liberty half dollars and they are worth about $12.75 for their silver content, unless the coin is in mint state, in which case the coin might be worth more to a collector.
It is necessary to know the amount of wear and mint mark (if it has one) to be able to make an estimate of value. I would suggest you take your coin to a reliable dealer and have it appraised.
There are no mintmarks on 1965 Kennedy half dollars.
If the coin has any wear the value is for the silver, about $8.50
They are still found in circulation, have no silver and are only face value
Half dollars in 1942 were produced at 3 US Mint facilities; Philadelphia, Pennsylvania {uses no mint mark}, Denver, Colorado {uses the letter "D" as a mint mark, San Francisco, California {uses the letter "S" as a mint mark.
It is necessary to know the amount of wear and mint mark (if it has one) to be able to make an estimate of value. I would suggest you take your coin to a reliable dealer and have it appraised.
An uncirculated Philadelphia half from 1972 retails for about $1.
There are no mintmarks on 1965 Kennedy half dollars.
If the coin has any wear the value is for the silver, about $8.50
They are still found in circulation, have no silver and are only face value
Half dollars in 1942 were produced at 3 US Mint facilities; Philadelphia, Pennsylvania {uses no mint mark}, Denver, Colorado {uses the letter "D" as a mint mark, San Francisco, California {uses the letter "S" as a mint mark.
Depends entirely on year, mint mark and condition.
It's just a common date half dollar that's still found on circulation, spend it.
Not being certain which half dollar you have, I can tell you that there was never an "A" or a "N" mint mark. The letters you should find will be a "D", an "S", an "O", a "P" or a "CC"
Need to know if mint mark is on the front or back of coin
It depends on what date and mintmark it is, post new question
$1 to $3,600 depending upon the condition of the coin and the mint mark.