The easy way to see one is, type in 1955 Double Die on your browser and click images.
There's a picture at the Related Link.
To determine if a 1955 penny is a double die, closely examine the coin under magnification for signs of doubling, particularly on the date and inscriptions like "LIBERTY" and "IN GOD WE TRUST." Look for a blurred or shadowed appearance of the letters and numbers, indicating that the coin was struck twice in misalignment. Compare it with known examples of the 1955 Double Die Obverse to check for similarities. If you suspect you have one, consider consulting a coin expert or numismatist for a professional evaluation.
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It simply looks like an x.
A double-sharp resembles a small letter "x."
There's a picture at the Related Link.
An Australian 1956 Penny looks almost exactly the same as any other Australian Penny minted from 1955 to 1964 inclusive. A 1956 Penny minted in Perth will have a mintmark (.) after the "Y" in PENNY (Y.). The Melbourne Penny has no mintmark. See the 1964 penny at the link below.
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
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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.
1 penny Also, A 1955 s Lincoln Penny can be valuable for it's doubling. Look at the dates on the coin and see if the numbers are doubled, or the inscription writings itself. If the writings or numbers are doubled, then it is worth thousands of dollars, do some research on these coins.
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.
Like this
There are pictures at the Related Link, below