The sharp high carbon steel blade is constructed full tang with a stacked leather spacer handle, double pinned Aluminum "Saddle Horn" or "Birds Head" shaped pommel and solid brass guard.
I believe that this tang stamp dates the knife from between 1934 to 1950. From what I’ve been able to learn, the tang stamps stopped mentioning the patent after 1950. It appears that these early knives were not stamped with a model number designation.
The Boulder generation uses the classic Platts split tang design. The back of the handle is a straight-line continuation of the back of the blade. The metal of the tang is visible at the back and belly of the handle. The saddle horn pommel is affixed to the split tang with two cross-pins, one through each of the tangs
Western manufactured knives for other companies as well, such as Sears (Craftsman and JC Higgins brands), Montgomery Wards (Western Field brand), Coast Cutlery, Western Auto, and others. If the old stacked leather handled knife you are looking at has the metal of the tang visible on the back and at the belly of the handle, it is of split tang construction and was made by Western Cutlery.
Decorative colored washers of plastic or fiber were used at the ends of the handle, with the leather washers in the middle, most of the time. Some were made with different patterns of stacking, especially when Western made knives to be branded for other companies.