Nice job Raimey & 2-piper, not much for me to add. 67/49 is a common gauge mark for any of the various 11mm cartridges; the most common in these guns is the 11,15x60R (.43) Mauser round that was also the German military cartridge, but there were dozens of others and any of them would be marked the same way. Chamber cast is the only way to go.

Most everybody of the GGCA "staff", such as it is, is off to the LV show. I'll be monitoring GGCA email and such since I stayed home.