The big question is how many of these M520's on a M58 frame are there? None of this info is listed in the SCSW (and it should be added to the 5th Edition, IMO). We know from my letter and the first part of the letter in the GB sale how many were made of the originals. There is also the reintroduction Model of 2005 that was made for a couple of years, which I consider similar to the Classic Series guns, and far removed from the original production in 1979-80.
So, where do these spare parts M520's fit in the grand scheme? The pictures of the GB sale are magnificent and exactly like the NYSP guns. Will they be more collectible than the original production? The auction sale price is less than what I paid for mine, but I always seem to be paying the premium prices, lol.
Late note: I noticed when looking at the pictures in the link that the cylinder was originally destined to be nickel plated. It has an "N" on the face, which has been overstruck with a "2". You can also see where the "8" in M58 inside the yoke cut was overstruck with a 2 and a zero, both of which are a different font.