Old SILVER coin- Early Spanish Cob??

[Patriot Relics]

Hey guys,

Dug what I believe to be an early Spanish cob coin out of a river here in Charleston, SC that borders a site dating from the late 17th century. It was originally covered in a heavy black crust that I slowly worked away with small bursts of electrolysis. I outlined in blue what I believe looks like a raised cross impression. I've dug a 1655 Charles II cob in the past but it is quite thin in comparison. This coin is about the size and slightly thicker than a quarter. I did a streak, chemical test that did confirm it as >90% silver. Let me know what you think-

 

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[Patriot Relics]

Here's another picture for size comparison.

 

[trdking]

Looks like a Very rough Cob to me

 

[Patriot Relics]

Thanks for your input trdking. Anyone able to point to a date range?

 

[Mackaydon]

1536 to 1734 (alpha and omega for cobs)
Don....

 

[Patriot Relics]

1536 to 1734 (alpha and omega for cobs)
Don....

The only thing I have to go on is this Charles II cob (1655-1700) that I found last year in the same area. The cuts are very similar, however the corroded one is much thicker. Maybe 1655 as well?

 

[trdking]

When you get back that far thickness is not even considered in the variable This is VERY crude technology e.g. Hammer a blob into a cob

 

[Patriot Relics]

Figured the thicker and thus heavier cob the higher the denomination