Here are the pics. I say it was a DDO that got stuck and was struck many times on the Obverse and Reverse. Opinions?
In 1955 (probably the night shift) Philly made 40,000 of these and had already shipped 20-25,000 of them before the error was discovered and the remaining pieces destroyed. It is one of the most counterfeited US coins there is. So the chance that it is a counterfeit compared to the chance that it is a legitimate coin that is not already slabbed or in someone's collection is remote. Of course anything is possible, but this is highly unlikely to be legit.
Your Cent would not fall in the category of Doubled Die Obverse or Doubled Die Reverse. That is totally something different from what this Cent displays. This Cent displays Double Struck! But it's true that these were easily faked so I can't tell you if it's a legit error or not.
But not the true Doubled Die Doubling.. and why not on the other strikes? This is a bad forgery Compare this true 1955 DD image with your doubling.. not even close! Your Cent shows no doubling on the word LIBERTY or in IGWT
Try and remember Randy, there are a lot of, and I use the term loosely, skilled "artists" out there. They are getting better at this every day, especially the ones in China. In fact a new Trade Dollar Forgery has just been reported. We all want to find something truly special but it just does not happen all that often.
Just to be clear (and for perpetuity) "this", as shown in the OP, absolutely is not an example of the "these" (55 DDO #1) you described. As for the rest, the fact a coin (such as this purports to be) is raw or isn't in someone's collection doesn't mean anything other than one should approach cautiously, and should certainly be the case here.
So that I am clear; the entirety of the words on obverse or reverse needs to be doubled to count as a DDO/DDR? I have a 1955 with just the "55" in the date doubled as far as I can see.
Yours is called a "Poormans" doubled die. Quite common. Sometimes used as a filler in the older albums that included the real deal slot.
While you're probably correct, perhaps Mr. Goatroper should post a photo of this coin just to be sure.