Dial replacement on 15400
Hi everyone,New to the watch world. I have recently taken interest in a watch.. it was a royal oak 15400, and was originally a black dial. The previous owner had sent it to a AP authorized service dealer to have the dial switched out from black to blue. Is there any cause for concern over here? From what i've read it's not too common, or even at all, that they switch to blue dials from white or black dials, as they are 'boutique' or special editions. The seller has sent me the invoice/service report outlining that they did do a dial swap from black to blue and I contacted the service dealer as well in order to confirm that the report is authentic and it was.I'm just a little worried because of what i've read. I just want to make sure that it's legitimate. The store I am buying from is very reputable and have been in the business for a very long time. Also, previous owner had apparently paid significant sum for them to switch it out.I appreciate your help!I've attached a picture of the

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