If so, its a bit hard to explain the 8x57 Type B in my gunsafe leaving the Oberndorf factory in 1922.
As I understand it, plenty more referred to in Speed's book.

Perhaps that's the reason (many/most/all?) were barreled-up with a .318 bore through the 1920s, rather than the .323 bore, even though throated for the later spitzer cartridge.

...or was it only the Type A that was restricted, perhaps?

Must buy Speed's book, but its become very expensive these last few years!