Vatican 1841 overdate

I've not been able to find this overdate in any book. It's graded by NGC MS65 BN 1841/0. Again, sorry for the bad pic's, I'll learn how to downsize the photo's to make them look better at some point in time.

 

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Here's another one with the same overdate http://www.numishop.eu/ficheboutique.php?id=fwo_164616&boutique=mo_mon&argretour=1&imprime=oui but I couldn't find any data about the overdate.

 

Thanks very much for trying to help me out. Looks as though it could be a common overdate.