As many of us are aware, the Professional line from Rolex is becoming increasingly more rare and difficult to find at your local authorized dealer. For this reason, the secondary market is on fire and it is only getting hotter with each passing day. If you are considering a GMT Master II the time to strike is now. This example checks a few boxes for avid collectors and newbies alike. This is a D serial number which means that this is the first year Rolex used calibre 3186 in the GMT Master II. The most notable feature of this movement is it’s use of a blue Parachrom hairspring. The blue Parachrom hairspring is not only anti-magnetic but it also offers better resistance to temperature swings, and according to Rolex, it is up to ten times more accurate than a traditional hairspring when subjected to shocks. Adding to the robust and durable nature of the movement are the thicker barrel walls and shorter mainspring. Many collectors prefer finer case dimensions of this version as well. This combined with the more discreet number plots on the 24 hour bezel give this GMT Master II a refined and slightly vintage feel. This watch was serviced at Rolex NYC in February of 2013 and comes with service records and box.