A rare date would be 1909-S VDB.
A rare date for wheat pennies would be 1909 S VDB.
No, the 1951 Lincoln cent is not rare.
All of them were supposed to be made of steel, however there were a few copper coins accidentally struck that year. Its extremely rare to come across copper pennies from that year.
Not really.
1943 silver pennies
1889 isn't a rare year for Indian Head cents. Please see the Related Question for more information.
There are no rare 1912 British Pennies. The "H" on the reverse, below Britannia and to the left of the year, indicates that it was minted at Heaton in Birmingham. There were 16.8 million minted.
Copper pennies from the year 1943 are exceedingly rare. Finding one would be extremely fortuitous. They are worth several thousand dollars.
they still make pennies
1815 is the only year U.S. one cent coins (pennies) were not made.
You do not specify the pennies of which country. The mint of the country concerned will decide the requirements for the year and publish their minting figures for the year in their next Annual Report.
For a specific answer, you need to ask about a specific year.
1991
They're not all that rare. If dirty and corroded, about 5 cents each. Really nice uncirculated examples can be bought from a dealer for $1 or $2.
untill 1996
Nothing in that range is classified as rare, but any British Penny in mint condition from those years would have a modest collector value to it.