Breguet

I recently bought a Classique 5920. I have been told that the mechanism is either an F Piguet 1150, which I understand is 3 Hz, or an F Piguet 1160, which I understand is 4 Hz. How can I tell the difference and what level of accuracy should I expect. Than... 

Hi Jeremy, The 5920 comes with either the Cal. 516 or 516/1, being the 4hz/72hrs and 3hz/96hrs versions of the Piguet base movement respectively. If you have another mechanical watch with a known beat rate, you might be able to tell by listening to both o... 

...I did not know it could come with either. Thanks John!

Hi Alberto, It might be that they changed the specification along the way and before a certain time they were all 516s and after that they were all 516/1s, I'm really not sure about that. _john