I have been researching the purchase of a good quality sub 2K$ GMT/UTC watch for months. I first looked at the Sinn 856 UTC, then moved on to look at many other watches, only to end up back where I started... considering the 856 UTC. Here's the thing, I am confused about the service options. I have been under the impression that this watch can be serviced by any qualified watchmaker. However, it has a copper sulphate capsule that combats moisture but must be replaced when it turns blue. Obviously, there is the option to send it back to Germany. I'm not crazy about that. I also understand that RGM services these watches in the U.S., but I have read differing reviews about this company. According to Watchbuys, they carry a supply of the copper sulphate capsules but do not make them available to outside watchmakers. Then there are those who say that the copper sulphate capsule may never need replacing so it should not be a consideration. So, what's the scoop? Five years after I buy this watch what are my options for service? Thanks!