The 1934 Philadelphia ( no mintmark ) Lincoln cent is common. In average circulated condition, values run from 10 to 50 cents.
a penny
Pennies both historic and modern do not have a mintmark for coins minted at the Philadelphia mint.
The mint mark does not determine the value of a coin. If you have a penny and want to know what it is worth, please submit a new question and include the date on your penny as well as the mint mark.
It depends on the mint mark
1930 Wheat penny: with no mint mark, in good condition is worth $0.10, uncirculated is worth $10.00. With D mint mark, in good condition is worth $0.15, uncirculated is worth 25.00. With S mint mark, in good condition is worth $0.15, uncirculated is worth $13.00.
A 1914 penny with no mint mark is worth about $1.50.
A U.S. 1965 cent (not penny) was minted without a mint mark. It is a common coin. A 1965 Great Britain penny is worth 10 cents if uncirculated.
Yes. $1.25 if there is no mint mark, $7.75 if it has a D mint mark, and $132.50 if it has a S mint mark.
1911 with no mint mark in good condition is worth $.20, uncirculated is worth $30.00, proof is worth $275.00.
It is worth face value.
1936 Wheat Penny: With no mint mark, in very good condition is worth $0.10, uncirculated is worth $5.00, proof is worth $135.00. With D mint mark, in very good condition is worth $0.10, uncirculated is worth $8.00. With S mint mark, in very good condition is worth $0.10, uncirculated is worth $8.00.
Normally the question has to be asked "WHICH mint mark?". However the only 1934 cents with a mint mark came from Denver so your coin has a D below the date. Most circulated 1934-D cents are only worth a small premium - 15¢ or so in worn condition up to a half-dollar with only moderate wear. However nice 1934-D cents in almost-uncirculated or uncirculated condition are scarcer and can be worth $5 to $10 depending on how well-struck they are.