Does anyone have any biographical information on Gabriel Calberto de Grau

Boosibri

The Compendio de la Piezas de Ocho Reales by Gabriel Calberto de Grau is a foundational two volume work documenting a fantastic collection of 8 reales. But who was Calberto? Anyone have any biographical information on this collector?

ELuis

No idea if this helps:

I can see many references to his compendium (two books), but cannot find any bio, but found some info related to him, under the document "Invitacion a la Numismatica (Invitation to Numismatic by Banxico aka Banco De Mexico)" in Spanish.

And talks about why he published the books, that first started as a way to understand and appreciate the series of 'Reales de a Ocho' and have at hand a series of properly ordered data. And also of the impossibility of owning all the pieces... that little by little it was becoming popular with friends, to the point that they requested its edition.
And end up in these two books...

Author: Gabriel Calbeto de Grau

ELuis

Found a little more about him, he was Catalan (Spain) who lived many years in Puerto Rico, from his collection, an example is the 1810 8R Popayan that in his catalog named the coin 942.

Around 1974 Calbeto dispersed his collection, selling all of the Spanish-American pieces to a dealer of California coins; The next thing know about the coin is that it was topped in a Pine Tree auction in April 1975, where it must have been acquired by the well-known American collector Ray Johnson, who kept it until December 1979, date in which he sells it to Sigfried Von Schuckman...