MY Daytona after 3 weeks

[vitix]

Guys i just received a call of the watchmaker that is "fixing"my daytona... fisrt let me tell you a little history of the Daytona i have

i was craving for this wonderfull look of the daytona, the WG silver dial with arabic number and red hands, but i dint have the money to get one so my watchmaker gave me an "idea", to get a SS and have a dial change... well i dint have the money for the SS either, so i sold my Tag Heuer Carrera, and i was saving some money, after a while the watchmaker called and he offered me a WG daytona but it needed some restoration, the good thing of he offering it to me is that i dont need to pay him cash, i can pay him in with different payments, so for me it was a good deal, he got a silver dial with red hands, the watch was the one i wanted...
after a week on my wrist the movement just stoped! so i took it to him and now it has been 3 weeks that he has it, i really miss the watch.
my mistake was that i dint check if the watch is a genuine watch, though i did saw the movement and it looks genuine, but i dont know about the rest...

can i take it to a AD for authenticity check? he just changed the dial, but i dont know if he is tricking me with the whole watch, the only thing i know is genuine is the movement, but i dont really know about the rest... when i had it on my wrist, i dint care much about it since the movement was real, but now i having seconds thoughts...