Hey Cayene
Something similar happened to me with my 5131P. I did not have the guts to turn it down when the opportunity to purchase it surfaced. But I did notice two things with naked eye: poor enamelling job (bubbling, much more evident with loupe) and a ‘damaged’ golden thread next to the 20hr mark in picture.
Did take it to Patek, and after watch got sent to CH HQ for evaluation, they agreed with me and replaced the dial. A much better one came back... so all in all good response by manufacturer, but im sure quality control is not that solid these days...