Value would be between $600.00 and $1900.00 Depends originality , bore condition,wood condition and every thing in between.Many parts on the various years are interchangable although slightly different and can affect value .A mint one with special features or history could sell for upwards of $3000.00
One in good to very good condition with a good bore, good wood,clear inspectors marks etc would be in the $1400.00 to $1900.00 area
They are wonderfull to shoot and quite accurate with the right loads.Graham