I wonder if anyone from the pressing/stamping community, goodness knows that covers sixty some years in present 33 1/3 era, can substantiate based on their listening experience that "mass produced" LPs can have substantial sonic differences as did the early RCA and Mercury classical pressings or even a perceptually different sonic signature. I guess I find it odd that the most trained listeners in the world of audiophile, the Harry Pearsons and trained music critics from all those esteemed publications over the years never mentioned such a phenomenon in their analysis of the thousands of LPs they reviewed and we all have read. Many times different labels were mentioned, and different vinyl formulations were certainly noticeable as well as engineering attributes such as direct to disc and half speed et al, but I, after fifty some years of interest in audiophile music, and having come from a trained music background, can not recall anyone ever mentioning this concept of different sound quality from different pressings of mass produced product until this recent reference. I am not saying an early pressing might not have more openness than a redone pressing, I am saying that out of twenty thousand Aja pressings with the exact same label, that I find it hard to believe there is a particular single pressing which shines enough to ask for ten times the current value because it is a "hot stamper". Having around eleven thousand LPs, I am more interested in culling than comparing, other than collecting different pressings such as most of us have probably done with things like Dark Side. After finding perhaps myself with ten versions ranging from British SQ to sacd, hopefully I have quenched that hunger. Am open for enlightenment, as I have been since I first read IAR and early TAS learning about sonic differences based on media, hardware, and listening environment, which is really what this is all about. Is there a sonic truth to "Hot stamper"?