Thanks Sky21, my comment was a little 'tongue in cheek'. The bezel does have a few marks on it, but it looks great in real life.
Not long after I bought the watch I also bought a set of calibre 321 spare parts off the bay (which I've never needed to use, sigh) and in amongst all the other parts was another DON bezel. This spare one is faded, but still everything quite clear. Comparing the two, I'm glad that the original one on my watch is in great shape, but I could see the other one being considered to have good patina if I ever needed it (hopefully not!).