Patek Philippe

I don't know much about watches but I recieved a Patek #3444 from my mother before she passed away that was my uncles. Took it toa shop to verify and they said definetly. Took to another for a second opinion and the guy showed me where the three screws th... 

Hi, Welcome here. Could you please tell us where you live? Maybe someone will have an answer for you (answers through private mail please). Cheers Dje