Vacheron Constantin

Hello there ! I am new here and i wanted to ask you a question about a Vacheron watch! VACHERON CONSTANTIN CHRONOGRAPHE ON THE FRONT: DIALS 12 , 2 ,4 ,8 , 10 MOON PHASE DATE DISPLAY DAY & DATE ON THE BACK SAYS : QUARTS TO MINUTES CHRONOGRAPHE SOMETHING EL... 

...  

.

How did you know that is fake btw ?