As far as die flaws they were all made with them fresh off the press as they say. As Josias mentions they all had a degree of hand finishing done to them making them appear as if there could have been different dies..
Regarding the HR there were early and late ring patterns as well as a little playing around with transitional rings.. I really don't get into them as I specialize in private purchase and have my hands full with them. Collectors like Josias ,John Pepera, Andy/Militarynut [who always has at any given moment the largest collection of HRs!] and many others here and around and of course Don are the 'go to' guys for the real intricacies of the HR..