If I can step out on a limb here, when we refer to Diamond Quality (not grade) and Regent Diamond Quality, those had numerical model numbers assigned to them as well. And, over the course of the Prussian Daly output, you might have only one Diamond quality in the line up or you might have 5 Diamond Quality models. And the numerical designation might have changed over the years for essentially the same basket of options. So in identifying them one really has to take a stab at year of production, then look at a relatively closely aligned catalogue.
The same holds true for the models below Diamond Quality.....ranging from model 118 to 185. One has to look at the assortment of features on the gun, figure out rough date of production, then look at the nearest catalogue.
