There are several different kinds of doubling that can be found on coins -- whether it's caused by a doubled image on the die used to stamp the coin, or caused by excessive wear or damage to the die, or caused by the coin being actually stamped twice, or caused by other reasons.
There is an excellent web page that explains the different kinds of doubling (with pictures) here : http://koinpro.tripod.com/Articles/OtherFormsOfDoubling.htm
Dan Moore The Working Man's Rare Coins http://www.workingmancoins.com
There's a picture at the Related Link.
The easy way to see one is, type in 1955 Double Die on your browser and click images.
There is no easy way to convey in text what you have to really look for. The first thing to do is look if "COPY" or "REPLICA" is stamped on the coin, if that is on it, the coin is a replica and has no collector value. If it doesn't have that stamped in, compare its dimensions to a normal penny, if all that works, I'd take it in to a reputable coin dealer and see if he can tell you if it is a replica or not.
It has doubling in liberty and in god we trust and there only 2 unowned
It looks like a penny.
It looks exactly the same as the 2010 or 2012 penny.
The US coin looks very much like a modern US penny
It is silver
like the old ones.
It was so different because it was double stamped. That's is about all I know. That's what makes it worth a lot more today.
real copper looks like a penny
Take another look at that date. Given that the year 2017 is still five years away, no real coins will have that year yet.
All British Pennies from 1982 to 2008 look pretty much the same as the Penny shown at the link below.
It looks exactly like the US cent.
It's worth a whole cent. The fingerprint isn't stamped in but was etched when someone handled it with dirty fingers. Over time, the oils from your skin will react with the metal in the coin, actually eating into the surface of the coin, which may make it look like the fingerprint was stamped into the coin. This is considered damage to the coin and can easily make the coin worthless to collectors.
See link below.
Well as we all know a penny is copper colored and is a little bigger than a dime.
opossums look like double lary of fur
Look at it under a lens. If you are still not sure then take it to a coin dealer and have them look at it.
Double helix looks like a twisted ladder .
Cents dated from 1982-present are made out of copper plated zinc. If you strip off the plating either by chemical means or simply scraping it off, the penny will look like silver. Of course, you can also plate the penny with silver. These do not raise the coin's value and its only worth a penny.
There's a picture at the Related Link, below.
There are pictures at the Related Link, below