Rolex Explorer I Red depth rating

I showed this watch earlier in Rolex Forum. There was some discussion if the watch is real or not because of it's red depth rating. The watch was taken to the Finnish importer of Rolex with several experience and Rolex trained watchmakers. The watchmaker in charge of vintage Rolex has been working for Rolex and in Rolex ADs for the past over 20 years. The opinion of this Importer, AD and Service Center is that the watch is totally real. The person who signed the certificate said that it is common in this age group of Rolex that the case back does not match with the resto of the watch. This watch belongs to my nephew and I can give his contacts to anybody seriously interested.

I have seen this watch and it is really nice. If I would collect vintage Rolex, I would buy this but now I'm just a broker without commission... Best, Kari