Bob thank you for answering. The entire case for this being a silver bar and hyped into 'Captain Kidds treasure' seems to be 'on course for the unfortunately sensationalized career of Mr. Clifford.
Rick, I hoped you would come in on this, as for years you have called attention to the character of Clifford and your views were from close personal contact with him in your areas.
I think the use of disguised lead bars as valuable plunder must have been one of those unexplored areas of maritime trade and of course the piracy which becomes part of those contexts.
The nature of the 'ingot' from the Ile St. Marie harbor is first of all, a bit too large and heavy for a silver ingot and from what I can find on the apparently esoteric area of lead ballast bars, this unusual shape concurs somewhat.
The so called markings cut into this bar are 'in the manner' of the assay and control markings on Spanish silver bars, but of course, much cruder and interpretative. Absent are the conventional assay characters and of course the 'bite' marks (chunks for analysis by assayer).
It seems more than irresponsible to announce the locating of the Adventure Galley based on this single bar without proper testing. All I can think of is that the media was already on hand as Clifford had already been in this location seeking the wreck for some time, and they were ready to pounce. Still, Clifford should have cooled things down and followed protocols.
One of the most notable issues with him is the lack of proper archaeological staff on hand to ensure these kinds of protocols.
What I am trying to figure out is what became of this curiously disguised ingot after the year of hooplah in 2015. While clearly not 'treasure' it is still a valuable historic item as it was probably taken by one of the pirate groups who frequented there, and tossed as worthless. That it was found in an area of debris from dock structures rather than wreckage of a vessel seems to support that.
Thank you for the heads up on that book ! Ill check it out

I will see if I can find out more as you suggest, and as always invite any other input from those reading here, it has always been a team effort here.
It seems appropriate that pirate ships so often used ADVENTURE in thier names !!!
It is exactly what they have given us!