Thomas Manufacturing Company, Dayton, Ohio USA. This lamp is I think an earlier type and will date from about 1916 to 1920. It is a 300 cp kerosene lamp with the valve below the handle and lacks a pricker. The tank on this one is steel but Thomas product was also made with brass tanks. Thomas never changed their model numbers as they improved and modified their models so there are several Model 1001 lamps. The burner shown here is correct for the model but is from another lamp which has an upper valve.