Generally, coins are valuable because of the price of the metals they are made from, but if you mean in a collectible way:
One thing that makes a penny valuable is the date. They older the coin usually the more valuable. Another thing is the mintmark. For example 1943 pennies with a "S" mintmark are more valuable than pennies with no mintmark. Another thing is the condition of the coin. The less ware it has the more it's worth.
Its maid of real copper
The most valuable ones are the 1943 copper penny, and the even more rare 1944 steel penny.
At least for Lincoln cents, the most valuable by far is the 1909-S VDB.
It's worth about 3 cents. Post-WWII wheat cents aren't rare or valuable.
im not sure what gives our money value. Do you?
On the 1969 S penny a doubling of the print makes it very valuable ($35 000)
Its maid of real copper
As far as general circulation coins are concerned, easily the most valuable Australian Penny is the 1930 Penny and the most valuable Halfpenny would be the 1923 Halfpenny.
Penny
Nothing
1937 penny
The Queen Victoria, penny-red, plate 77, one penny stamp.
the most valuable is the penny in the us has a head on the front and back hope this helped :) :) :) :) :)
The most valuable ones are the 1943 copper penny, and the even more rare 1944 steel penny.
The rarest and most valuable Lincoln cent that isn't an error is the 1909-S with VDB on it. The rarest and most valuable error Lincoln cent is the 1943 copper penny.
penny
The 1909-S V.D.B.