Ulysse Nardin

hi i have been offered this watch from a local vendour , since i am not a ulessy guy so need expert advise to go for it or not. movement NA 11 QU . ref no. 10931-1. please also comment on the dial thanks and regards ...  

... the pictures are a bit poor in quality, but from what I can see it is a genuine UN, produced in the Seventies or early Eighties. I do not know the movement, UN used the Nx 11 xx designation for many different movements supplied by other movement manuf... 

hi the rotor design also puzzeled me the other thing was that the movement sr# had golden colour filled engraving but the rotor engraving was plan silver .... in any case i let it go although it was a very good looking watch.....thanks and regards