Wrong dates for Mexico KM#352

Both dates provided for this coin are wrong:

https://en.numista.com/catalogue/pieces57248.html

The only years this coin was made are 1856 and 1857:

http://www.ngccoin.com/price-guide/world/mexico-14-real-un-quartouna-quartilla-km-352-1856-1857-cuid-4965-duid-16766

Even metal variant KM#352a was only made on those two years as well. (Coin request pending approbation).

Year list isn't locked yet, but the user who registered this coin marked the 1860 year as owned, so it cannot be deleted by a Change request.

Please correct.

Also, delete this one as it is a duplicate and the referee already requested deletion but users are starting to register their coins there:

https://en.numista.com/catalogue/pieces64586.html

No fixing yet on the 352?