OK, I just got my 7th Edition ESC (2020) and have looked at it for a bit. Not sure if I agree with all of the designations and have found more deficits in the proof and pattern section of the 20th C. pre-decimal series. One thing I notice is a referral to "page 657" in several places and note that the volume ends at page 597, or at least in this copy.
Also I noticed that there is not the reference section related to Provenance the way there was in 6th Edition pp. 583-647. That was hugely helpful, does anyone know if this was somehow left out or just what happened? Maybe my edition is somehow short of this...