I have noticed a circular mark ( not a scratch) on the face my Formula 1 series 3 model. Could this be a mark on the AR coating ? Can it be rectified ?
Formula One series 3 is too vague, can you give the exact model number, and pictures would help. From my personal experience: if it is on the outside coating on the crystal, you're stuck with it unless you either polish it a little bit, with the risk you will mess it up more, or polish off all the coating, problem solved.
WAC1111.
Tto my knowledge, 99% sure as I don't have the watch here, no AR coating on this watch.
Try polishing the crystal with some tooth-paste, just mildly, and check if the mark dissappears, the crystal is Sapphire so it shouldn't make any marks on it.
Succes!