Hello,
I have what I think could be a misprinting of a 50-cent Mexican peso with the printed year of 1894 (it has the look and feel of the 1994 coin). Please see the following picture:


Is there a way to collect these things? Should it have an entry in Numista? And does it have any value? The first time I face a coin with a potential error and I am unsure how to deal with it in Numista.
Thanks.
