You値l need to start by buying a Perpetual calendar at full boat bare minimum. You値l also need the be dealing with the owner or decision maker.
I知 told Patek churns out a lot of 5712 relative to 5711 so it痴 an easier pursuit but you値l likely need to spend 100-150k first depending where you live. You can then unload those watches and arrive in a similar spot to buying grey.
If you can land it by buying 1 PC you値l be in net positive territory relative to grey. 2 PC and you might as well go grey.
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