It's a common date, worth 3 cents.
One cent. It's almost certainly a coin that someone altered, so it would have no additional numismatic value.
The value of a penny with no mint mark is generally one cent. These pennies are the common cents that were minted in Philadelphia. Older (i.e. pre-1950) Philadelphia cents can be worth more but it depends on their date and condition.
Reatil for circulated coins $3.74- $4.20 Mint state $4.30
The value of any coin depends on its condition and date. The lack of a mintmark simply means it was minted in Philadelphia; US cents, often mistakenly called "pennies" after their British counterparts, have never had a Philadelphia mint mark applied to them.
A penny has a value of one cent unless it is a collector's item and then it is worth more. That question is FAR too broad. To know the value of a coin you need to have its date, condition, mint mark (if applicable) and country of origin.
In general, 50 cents for a USA 50 cent piece. Additional value will depend on condition, Series of 50 cent piece, mint mark, does it contain silver (Pre-1965) and year minted.
Depending on the condition and mint mark, it could be worth anywhere from the melt value ($11.00) to $600.00
The US never minted a silver cent. For starters, it would be worth more than a dime! If you have a Lincoln cent from 1912, it was plated for use in jewelry or something similar. That makes it an altered coin worth face value only. Unplated, its value could have been much more depending on its condition and mint mark.
No mint mark indicates that it was minted in Philadelphia. The coin is worth exactly one cent.
It's not missing. The Philadelphia Mint started using the "P" mint mark on half dollars in 1980. the coin is 50 cents that's all.
In G4 condition (heavily worn but readable) retail prices as of 09/2008 run around $12 regardless of mint mark.
There's never been a "B" mint mark on any US coin. Denver was the only mint to use a mint mark on 1956 cents; if your coin has a small "D" below the date it's very common and only worth 2 or 3 cents in average condition.
Without knowing details like the date, mint mark, and condition, the best possible answer is one cent.
depends on the condition and mint mark
Face value unless it has the mint mark "S".
Well a 42 cent stamp is worth 42 cents. There is no mark up on stamps. They cost face value.
The lack of a mint mark means it was struck in Philadelphia, and value is 1 cent.