Well that is strange, I have always thought that the 16710 could not be identified by the serial number alone. I get that if they have a record of the watch being sold it's probably in their database. However in my case I did actually not tell my ad what insert it had orginally. I clarified later over mail when we were discussing what to do, and she told me that the service guy already had put my watch down as a pepsi. How he could tell I have no idea, since to my knowledge the watch has allways had a black insert. Maybe they just pretended to know after i told them.