As stated above, you must separate the Original Quality grade from the maker's name. With the (possible) exception of Boss, most makers made/sold guns in a wide range of quality grade. Quality grade was what determined original price. Fabricating shops were run/staffed by masters. There were no big secrets as to design, material of workmanship. The price paid determined the quality made. This is the very essence of the proverb, "Buy the gun, not the name!"
The modern USA market can be estimated for 1890ish-1960ish 12 bore typical guns based on the Brand Value level of the maker's name, the Original Quality grade, and the Current Condition level. Pinfires seem to be priced more as antiques than as working guns. I'd call your gun an upper mid quality gun from a known maker and in good current condition.
