Originally Posted By: ellenbr


91/83(9,40mm) plug gauge which would pair w/ that 1903 Z-M date then mm stamps may be from a proof effort @ Suhl prior to 1912......


Let's make that prior to 1922 to be correct. I assume that in 1903 in Z-M the mm mark would not be applied and that if it passed again thru the Z-M proof facility post 1911 then a 2nd date code would be applied. Odd though that the diameter didn't seem to vary much and that there isn't a Crown over R / Reproof / Repair mark applied.

Cheers,

Raimey
rse