by the shark of Montecatini, who in the early 1990s was seen walking out of the old Panerai premises with a box full of watch cases 
At least 16! 6154s came from Montecatini. They have all kinds of weird movements. When I visited him the first time in 2016, he told me he had found them in Egypt. Later he changed the story. Someone else had found them in Egypt and sold them to him.
Cheers
Jose