Counterfeit 1726 Ecu, 8 Reales?

They all have "issues." The Mexico cob would likely date to the 1600s and looks real but is missing much information. The 1726 French Ecu has graffiti and oddly its mint mark which might be "H" for La Rochelle is blundered. The Mexican Cap & Ray dollar is not good and the last coin needs to be looked up, but has significant wear. Truly this is an odd lot!

Guess someone didn't think so

John S. Davenport many, many decades ago warned of high quality counterfeit and fake European crown sized silver coins.

With the severe lack of pictorial detail shown here, it would be impossible for me to make a decision to even consider them, let alone 'pull the trigger' to buy.

I would very much prefer to examine each item closely in hand first, even given a cast iron guarantee that they were all genuine. The stakes are too high for me otherwise.

My only two guesses are that the French ecu is real, but with later graffiti, and that the date of the Livorno tallero may have been tampered with. It looks like 1678, which may be an unlisted date? If it is 1675, the last digit looks too large in relation to the three smaller digits that precede it (I could not find a photo of any date in the 1670s for comparison, so that comment pertains to later dates of the same type).
And yep, somebody(ies) thought enough of them were real to bid it up pretty high despite the poor condition.

Edit: I found an image of a 1675 Tallero (maybe you already did @gincoin), and the last digit is considerably thicker than the 7, and also rounded enough to be mistaken for an 8 with wear, so I think this coin is likely a 1675. Maybe this is where the buyer saw value, as it is quite a rare date for the type? https://www.acsearch.info/search.ht...us=1&order=0¤cy=usd&company=