It is stated that the gun that is the subject of this thread is a Grade 6R EE Excelsior. Earlier in the thread there is a list of other grades from 1921. Are any of the higher grades known to be in existence? I can only imagine what they might look like.

During 1921 the following grades were in use:
0 - 1 - 2 - 2/R - 3/R - 4/R -5/RE - 6/R - 6/RE - 6RE/E - 7RE/P - 9/P - 9/PE -
9RE/A - 205 - 206 - 208 - 210 - 9C/R - 10C/R - 12C/R