considering that Patek's reference 124 in the 30's was supplied the 8-day movement from JLC, and PP's first world time watches had JLC movements.
These days, they are 2 of the only companies making their movement, case and bracelet (both buy straps and glass), and both save tools.
"You know, you never really own a Patek or JLC, you just hand them down....."
-Dean