the most valuable is the penny in the us has a head on the front and back
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Lauren Jackson
Gold
A dolphin.
Probably a diamond.
The Penny is used the most in the US.
penny
The most valuable stamp is the inverted Jenny. It was auctioned for over 3 million. There are only about 100 pieces in existence today.
Most Valuble Primate
Monkeys are a valuble extinct series. Not only are they one of the smartest animals on earth they have provided scientists valuble information about the world around us.
The side of a US penny with the image of Abraham Lincoln weighs more because it has higher relief due to the design.
Currently its dwindling oil reserves.
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