^ but that's considering that you can predict which rolexes will be popular in the next 50 years. You can predict the potential buyers of such an item. For example, will the guys that are interested in vintage watches (1950s-1980s) rolexes be interested in this stuff? No. Then who?? the buyers of 1990s 16610 ; they're willing to spend (around 3k) which is about half of the price of a new mint 16610. Unlike vintage rolex watches, the new watches are mass produced and so it will never be as rare as the vintage watches or be as highly priced. Thus, you can reasonably predict that in about 20 years, the price of a used GMTII master will be around half the price of whatever GMT Master version rolex will come out with.