There are no special markings on the Lipsey's gun, at least none to identify it as a special run. They may or may not be identifiable by serial number - only 1,000 of the Lipsey's models were made - but I suspect Ruger will just continue the serial number line. Could be completely wrong on that as it is pure speculation. They do use the same 520 prefix from the .357 Anniversary models so I figure that designates the mid-size frame.
As to quality control, who knows? We know their .44 Spl chambering reamers have only been used 6,000 times so they're still almost new.
As stuff wears the tolerances may get slack. But they've been making .44 Magnums for decades and all of those I've owned since 1972 have been pretty good.
One thing for sure is they sure as heck are nice revolvers.
