I think that's a condor, not an eagle, above the flags and shield on the reverse. It's definitely Simon Bolivar on the obverse, or 'heads' side of the coin.
These are low-value coins made of copper-nickel. They are worth a few cents each. If you can find a fully uncirculated specimen, like the one in our picture, a collector might pay a few US dollars for it.
Some 50 centavos were minted with medal orientation instead of the normal coin orientation. If you can find a 1958 50 centavos with medal orientation, you have a coin with a catalog value of $22 in well preserved condition. Some 1959s have medal orientation, but they are worth about one-third of the 1958 coin.
To determine orientation, hold the coin between your thumb and forefinger, with Bolivar's head upright. Now turn the coin from left to right (not top to bottom) like you are turning a page in a book. If the condor is right side up, you have a medal orientation specimen, the valuable one. If the condor is upside down, you have a coin orientation specimen.
Further, there are some 20 and 50 centavos with two dates, 1810 and 1960. These coins are worth a little more than normal coins with one date. They might catalog as high as $10 for fully uncircualted coins.