The TACHYMETRE font looks wrong and overall print looks slightly thicker than an Omega bezel, it's also very clean and unmarked with no age, might just be the picture but that was my first thought when I seen your watch.
Afaik the bezel is original to the watch, and I bought it partly because of the bezel. According to MWO it is a B3 bezel: Sorry for the picture being turned over...
Possibly the picture makes the bezel fonts/print look quite fat along with the rich black paint, sorry if I'm wrong..