10.06 / 739 is the Zella - Mehlis datecode which denotes that it was number 739 for the month of Oktober, 1906 to pass thru the Z-M proof facility. AK was the actioner & LK was the tubeset knitter. The vulgar fraction 17/1(0.655") is an old gauge diameter and was not in mm. If absent of choke, the tube will not wear the Crown over W(Würgebohrung).


Cheers,

Raimey
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