shanebevel,
The 118,35(they used a , where we use a .)is the bore(not groove)diameter,expressed in gauge. Rifles with this mark usually have a groove diameter of around .358.It supports the idea that the nominal caliber is 9.3x72R as stated.However, this same marking is found on other caliber rifles such as 9x58 1/2 R S&S,9.3x57R,9.3x70R,9.3x82R Nimrod,etc. A chambercast would be necessary to determine the correct chamber, but "likelyhood" would be on the side of 9.3x72R. The crown U is the mark for a "view proof", which is really a detailed inspection.While I didn't see the usual marks indicating it, my overall impression was that the drilling was likely proofed in Zella Mehlis, therefore made in the area.
Mike