the most valuable is the penny in the us has a head on the front and back
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Lauren Jackson
A dolphin.
Gold
Probably a diamond.
The middle of the penny weighs the most.
The Penny is used the most in the US.
The most valuable stamp is the inverted Jenny. It was auctioned for over 3 million. There are only about 100 pieces in existence today.
penny
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.
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Currently its dwindling oil reserves.