Very interesting reference to Carinthia.

This is the damascus sample display in the Buchsenmacher u. Jagdmuseum of Ferlach, and Carinthia is upper right



Steve's tube certainly appears to be 3 iron acid etched Bernard I, which was a very popular pattern in quality Ferlach and Suhl guns



This is a close up of the acid etched Carinthia sample, unfortunately taken through the glass of the display case



I don't see the repetitive pattern of loops in Steve's barrel, which carries the Liege provisional proof and ML in an oval - likely Manufacture Liégeoise (1866-1929) though usually a crowned ML.
17.2 should be the bore in mm = .677" or an overbored 16g? 14g is .693"

https://sites.google.com/a/damascusknowledge.com/www/home