What caused the early drum rotorss to be the color they are if they are not plated-
Are the 21 internals nickeled in some manner or is this another example of merely color without any reason or function?
I thought the nickel internals that cost an arm and a leg today were partly responsible (in addition to the lighter actuator) for the increased ROF of the 21 vs. the 28 and all subsequent models.
Its hard for me to see the difference between plated and coated as "something" caused these parts to NOT be blued and are certainly never described as being "in the white"

oh, for my own edification- If you could only buy 2 books on the Thompson what would they be and could I get them autographed?
Thanks for the education Professors'
