i have a penny from 1858, but it is in rough shape (it looks like someone tried to drill a hold through it and use it as a "charm"...i don't know how much it is worth, but i'm not planning on using it for my retirement by any means...i just kept it because "it's neat".
I bet none of your pennies are worth as much as this one would be, if you could get to it!
The value of the penny, or the value of it based where it's gone? A 1909 VDB first year Lincoln head penny is worth $10-$20 based on condition... but to have the one that was used as the MAHLI calibration target on a Mars Rover? Priceless - couldn't set a $ amount -- if only you could figure out how to get it back to Earth!