What makes this gun really rare is that it is a higher grade NIG from quite late in the production period. Walter managed to show a C-Grade and a D-Grade in his book, the C from 1889 and the D from 1901. The C-Grade from 1889 that Walter shows has considerably more profiling on the breech balls and Lefeveresque "wings" on the barrels. I wonder if an E-Grade NIG has ever surfaced?
Here is an A-Grade made a couple of months later in 1910 than this C-Grade --
