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I know nothing about these. I assume the Mo means Mexico city mint. It looks like a "J" under the M. Don't know if cardboard holder is correct on the date so any help would be appreciated. Thanks.

Mo means Mexico City. Cob 8 reales with Assayer "J" appear 1707-23, according to Krause, so the date could be 1714 or 1715 as written on the 2x2. I can't see a date on the coin, so it must either be very weak or (more likely) off the flan.

Sounds about right, grivna. That's the same conclusion I arrived at when I acquired a similar one a few months back:



Always liked those rough hunks of silver

Also, if assayer wasn't visible - you could still narrow the date down. You would know that it's a post-1700 cob because of the presence of the Bourbon escutcheon of three Fleurs de Lis, placed in the center of the shield, since Philip V was the first of the Spanish-Bourbon dynasty and his first reign was from 1700 to 1724. Also, you could establish that it was minted prior to 1743, when Mexico City mint stopped the striking of cob type of coinage altogether.

~Roman

Thanks very much. Amazing how much experienced coin people know.