I have my ex's Patek Philippe watch and am wanting to find out if it is authentic. Any help would be great.?

Genuine leather band. With Patek Philippe Geneve stamped on it. The face of the watch also has that on it. You can see the mechanisms in the back casing as it is glass encased. It is stamped inside Patek Philippe Geneve also in gold with a symbol.|||there should be a serial number, contact the company directly, look for a web site; or talk to a good pawn shop or watch repair shop