The one on the left was one of the first five DW sold. "halley" from years ago sent me some pics to see if I was interested... boy was I! The one on the right has a tiny bulge at the crown tube opening, it was the v2.0 case.
Old ground glass Revo. Nothing finer. Heads up: I dropped a pair in the surf around 14th street in Ocean City NJ and never got them back. Finders keepers!
Mark, perhaps you can add a hallmark to your pieces as a signal to people in the future? I know a very high end dial maker that has started doing this for exactly this reason: his pieces were being sold as gens. The hallmark tells the truth.