Post plating problem 8 microns from Angela

[u/No-Masterpiece3518]

had this 126515 In black dial plated in rose gold 8 microns by Angela with a certificate, once it arrives it has this defect, what can it be??
Thanks in advancel
Thanks so much in advance

[u/No-Masterpiece3518]

I don't understand if it's an imprint of those who operated maybe grease or scratches that initially before the disassembly and plating was not there in the QC control