![[Linked Image from i.postimg.cc]](https://i.postimg.cc/tJjNGm9j/barrel-mark-2.png)
>>875 . 15'5 . 15'2 . 97.<<
Nr. 875 with one tube having a diameter of 15.6mm and the other being 15.2mm in 1897.
Typically, if an inland sourced longarm, the tube diameters of the same bore are shown as one diameter as below.
![[Linked Image from jpgbox.com]](https://www.jpgbox.com/jpg/66196_1024x765.jpg)
>>1922 . 25 . 15.5<<
Carl Goulch in Linz example passed thru an Austro-Hungarian proof facility in 1925.
So I really don't have this difference sorted unless the two tube diameters are within some tolerance and be considered one in the same in the preliminary datastring?
Serbus,
Raimey
rse