The rarest British Penny would be the 1954 Penny. There is one known to exist, maybe two, but there could be some doubt about the second.
One of the rarest Lincoln coins is a penny. 1909S VDB. S designates that the coin was minted in San Francisco, CA and VDB are the initials of the designer of the coin.
1909
The coin that is not a penny is a quarter. The other one IS a penny.
The rarest Australian coin minted for general circulation would be the 1930 Penny of which there were only 3,000 minted. It is currently esitmated that there are still about 1,500 of these still being traded in the market.
A 1909-S VDB penny!
Please be more specific, no one coin is known to be the rarest, even if there is only one.
coin penny 1988 one 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.
Indian head penny
A penny is a unit if currency (money), thus one penny means one unit/coin of this currency (1p).
Indian head penny
If you refer to general circulation Australian Pennies rather than Proof coins, the order runs something like this - 1. 1930 Penny is the rarest 2. 1920 Penny with no dots on the reverse 3. 1925 Penny 4. 1946 Penny