The Mk1 DRSD (my fav) was (until very recently) considered the most valuable DRSD due to its having a slightly lower profile case than later DRSDs (thicker than a Sub, but thinner than the average 1665). That auction (Antiquorum's infamous Revolution: The Evoluation of the Rolex Watch) marked the zenith of Rolex values. (I watched the auction, live, & posted a play-by-play chronicle of prices as the hammer dropped on most of the more prominent pieces.) If I remember correctly, there were 2 DRSDs that sold for more than $200k each, which caused the demand for DRSDs to increase to a fever pitch - at least for awhile. However, shortly after the completion of the 'Revolution' auction, the global economy began to slide & Rolex prices likewise deflated (a bit) to merely ridiculous levels (as opposed to their previously psychotic levels). At least, that is my take on it.