Wall sconce brass oil lamps

Has anyone seen wall sconce oil lamps like these. I'm researching my pair but have nothing to go by. All I know is the base is brass, about 8" tall and the glass chimney is about 12". They attach to wall by a bracket on back and the chimney is held in place by an adjustable brass stem. The oil reservoir is small. These are in very good condition and are quite pretty and apparently unique. My mother said she bought these in an antique store years ago fo $25. She said she saw a pair like them one time a few years later and they were priced at $135. But I haven't been able to find anything remotely like these online. Any help is appreciated.