Nice find, thanks for sharing!
Just, I personally feel the owner a little too enthusiastic (even if comprehensibly) when he claims:
"... an officially certified part of Panerai watch experimentation history, showing several interesting links between the Vintage, Pre V and Vendome watches we see today and ideas never commercially put into production.
It was conceived and produced in the first years of the Vendome Panerai take over, giving it an overlap of both the oldest and most cutting edge Panerai ideas and styles."
"the first years of the Vendome Panerai take over" actually place it after the mid '90s and qualify it 'just' as a prototype on mixed and confused thoughts and things near to come. What any PAM lover would rather need are insights on the most obscure age of the Panerai history, i.e. the 60-80s years.
That said, I would probably give a finger to have it.