JRH;
Upon further examination of the size marks I was speaking of, I believe they are not present on this gun. Reason is Germany's proof law was not enacted until 1891 & this one was built prior to that. Guns which had been completed & ready for sale when the act took affect were stamped with a Crown/V which made them legal to sale under the new law, but were not actually proofed. The gauge mark I spoke of would have been stamped by the proof house. This is found on guns made after 1891, but normally no later than 1912.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra