Error? What do you see, where. It's a nice 1955 S example with scratches and stuff on it. coins from 1955 has been around for a while. So if you are looking for an error it's probably well documented and you should search for that. Can't find anything? Then maybe you are seeing things that aren't there. but, for yours, search/look for "BIE - die chips" if you think you see that. https://www.cointalk.com/threads/another-for-the-paddyman-die-chip-files.330416/#post-3299402 be careful of your lighting/reflections making false visual abberations. from usacoinbook maybe the error was you paid too much for it?
It's a rather common "BIE" die chip/cud break. Check out the Lincoln Cent web page http://www.lincolncentresource.com/FAQ/BIE.html
Niether CUD nor Lamination It's a BIE Die Break http://www.lincolncentresource.com/FAQ/BIE.html Edit*.. I see someone shared the link already