Mexico 1876 Fifty Centavos With Wide Variation In Date.

Hi rooneydog I couldn't see the picture of the coin you were referring to, but the overstruck date on this coin is the 8 which is the hundreds, not the decades. I am assuming a restrike on a coin 100 years previous wouldn't be very likely. I have worked out why I couldn't upload now so will post the pic of the coin. Note the size of the 76 compared to the 18.

Hermosillo Ho F

It seems likely genuine to me. I'd not be surprised if the dies in these provincial mints were made using punches rather than a complete hub. In other words, the impression of the eagle would have gone in separately from the inscriptions, & the diesinker would have punched the digits in the dates separately. If it were hubbed, then quite possibly the Mexico City mint sent out a bunch of die blanks every few years with the eagle, legend, & first two digits of the date, leaving the final digits to be filled in as needed ; in that case, what appears to be an overdate "8 over 7" might just be damage associated with the die crack. It's obvious that the "18" is from a different set of punches than the "76", anyway.

Looks like a sloppy reengraved date.

Hello NumisMex thanks for that info. I didn't end up buying that coin, eyes far bigger than bank balance unfortunately. I have made a firm resolve to be more responsible in the future.
The coin in your avatar is really beautiful, is it Nicaraguan? I saw one today and it said it was Ng or something. It was $825 I think, might get an even dozen of them.