Known to be in his personal collection. I found the interview when he said his late-ex-wife gave him a Cartier, and his wife gave him a Blancpain.
I like PSM and read his website very regularly. Now without him, PSM is in a very strange position, much like Frank Muller without the founder, or Roger Dubuis without Dubuis.
Have you watched the 2015 film Survivor? He stars as a watchmaker in London i think.