Philadelphia has never used a mint mark on cents.
You're probably seeing a mis-shapen D mint mark. Mint marks before about 1985 were quite a bit smaller and often clogged up in coin dies.
In any case there were well over a billion 1975-D cents struck so your coin is worth a penny.
It's not a Mint product. Private companies take ordinary cents, plate them with brass or a thin layer of gold, and stamp various symbols (Lincoln, state abbreviations, etc.) on them and sell them as "collectibles".
They're considered to be altered or damaged coins and have no special value to coin collectors. Some people do collect the sets but they have to be complete and in their packaging to have any extra worth.
It's a novelty coin that has no collectible value.
means it was minted in san fransisco California and they stopped doing that in 1974
It's worth 2 cents for the copper.
Proof pennies are only made at San Francisco. It's not a proof. It is just a penny worth a penny.
Value depends on the size of the clip, average value is $3.00-5.00
It's worth about 2 cents for its copper content.
Not sure. I have a 1974 penny with a baseball batter and pitcher stamped in front of lincolns face. The batter's jersey ends in 'TS' Any idea what this coin is?
It's worth about 2 cents for its copper content.
The state was stamped on it after it left the mint. It has no collector value -- novelty value is perhaps 25 cents.
It's almost certainly either a privately-issued piece or a genuine penny that was altered. Either way it has no collector value.
It's a novelty coin made by a private company that has no collectible value, but it's still one cent.
Penny Gold - 1974 is rated/received certificates of: UK:A