after a debate over the past year, with tons of pics showing casting evidences versus opinions built over the years by comparing original rings with repro ones to support die press theory, I sincerely think that the more we debate arounds microscope pics the more everyone stay on their own position.
I have no reasons to believe to theory that Gahr used a revolutionay way of production dedicated to SSHr just because ordered by Himmler. In my opinion Gahr made his rings by the way which granted the best quality...so die pressing them.