I often visit Pisa and Verga even just for a coffee, where you'll find the most friendly and prepared folks. Pisa has now essentially colonized the entire upper portion of Via Verri, down until the corner with Montenapo, so that will be a terrific trip for you to have at their various boutiques and the flagship. Their huge Rolex boutique and then an AP boutique are also within a few minute walk.
This is what a Milano AD pulled out from the safe the last time I dropped by, just to give you an idea of their level of equipment with Patek! (not sure if the 6102s would have been available for a first-time customer, but I'm sure they'll be more than happy to show them to you if you just ask).
Of course, just don't expect to be offered the sports watches for which everyone else has been waiting 10 years, if that's the first time you drop by (in Milano like anywhere else on this planet ;-)
Enjoy beautiful Italy!