When was a single barrel 12-gauge shotgun stamped 330997 manufactured by Hopkins and Allen?

Hopkins and Allen were in business from 1867-1914.There single shot shotguns date from 1902-1914,but they also made a falling block single shot shotgun from 1887-1902.These were in 12 gauge with a heavy frame,and in 16 gauge and 20 gauge with a medium frame.from 1902 onward to 1914 all shotguns were made of the tip over design.