A couple of years ago, I had a PAM111 polished when serviced at Richemont. Polishing was included in the service price then, though. It was done very well & came back as new, with no noticeable loss of metal (I accept there must be some loss). In fact, it came back looking so good I've rather babied it since.
When it came to getting my time-worn, favourite, PAM114 serviced, polishing was an extra & I decided against it.