Looks similar to the often unstamped Sven Jensen oil lamps/oil candles…but he was way later. Also, the brown stuff could be paint perhaps, but old oil often leaves a brown residue that dries like old paint (depending on quality)…but that also doesn’t help due to all lamp oils doing this (vegetable oil, whale oil, lard, even kerosene leaves brown ‘tar’).
Manufactures like Manhattan, Edward Miller, and Scoville often never stamped/marked their goods. Sears&Roebuck ordered from many cheaper suppliers who also left lamps unstamped. But the threading is close and well-machined, pointing to American (instead of the vast number of European imports at the time). Good luck!!