How to tell if real or fake?

Have a chance to buy this pre-owned but without box and papers. Anything about the watch scream “fake”? 

Hi , 

i am close to purchasing a Chrono Petite Price , seeking feedback on watches authenticity 

Purchase date Jan 17 
location: The Watch Gallery
Serial no. 5582379
Come with box and papers
Private seller on line. 
Seller seems very genuine so welcome feedback.

thanks