If its from the 170000 ! Iguess.
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About $2.00 for average proof coins
8-15-11>>> The first thing is the coin can't have a mintmark. Proofs were only struck in Philadelphia at this time and were NOT relased for circulation, less than 6,000 were struck. I don't know what makes you think the coin is proof, but the best thing to do is take it to a coin dealer.
A "D" means that the penny was minted in Denver An "S" means that the penny was minted in San Francisco (note - only proof cents are now minted there) A penny without a mint mark was minted in Philadelphia
For the collector value with the exceptions of errors and specially made proof coins, the penny would have to be made before 1959.
If it is a proof then it will have the mintmark "S". If your coin doesn't have the mintmark "S" then it is just a normal coin.