Piece of 8 on large flan - ID regarding style needed!

[monetanova]

Looking for any advice regarding in depth identification of these kind of cobs when assayer and date is not visible.
Very nice coin in hand - almost cup like - as the strike has been pretty strong.

 

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[Mackaydon]

Welcome to Treasure Net !!
Mexican coin; reminds me of a Carlos II cob .931 fine (1667-1700).
Don....

 

[Mackaydon]

Denomination will be determined by its weight: 27.5 grams is the benchmark for an 8 reales coin; proportionately less for 4-, 2- and 1- reales.