The key here is to take the Saris book and compare it carefully with the Mitteilungsblaetter in the year 1934 when all of this system we know from our cast off, foetid woolens began to take shape.
History is: chronology, cause and effect, and, finally, judgement. In this case, the chronology is crucial, as the NSDAP PO caps underwent steady changes that you people understand far better than I do.
Since SS caps followed the lead, more or less, of the NSDAP fashion, such interests me.
However, none of us knows nearly enough about all of this, though the reading of the UM and the RZM circulars makes the thing much more powerful, three dimensional, and clear.
I have in my own mind a sense of when certain RZM tags came into use, but I do not understand all the permutations and variations of same by a long shot.
But the RZM circulars are pretty revealing, all the same.