Rob Thanks for that detailed answer. Much appreciated.  The coin is an 8 Reale and is a shipwreck coin.  No grading has been given as it is bought as seen [lots of piccies]  It’s been on the seabed for 219 years so the condition isn’t that good. The value in this coin is in its historical value and not its condition,  also the certificate is proving it is from a shipwreck,  not that it is genuine silver 8 Reale. I think the bloke that is asking the question has not read the advert properly. Cheers again for the info.     Bob.