An early American made Primus. Missing its pot trivet and outer burner cap. I have been through the catalogues and am unable to find the date of manufacture or the maker. The only identifying marks on it are on the fuel tank cap which reads - PRIMUS - Use Kerosene Only - Cooking and Heating Apperatus - Pat. July 4th. 93(1893). The fuel tank(2 minor dents) holds about the same amount of fuel as say a standard Primus/ Optimus Nr.5. The bottom edge is folded with the mildly convex bottom fitted further up and heavily soldered. The burner looks original and the steel inner cap is about the same size as say a Primus Nr.4 burner. The outer cap is missing. Notice the air fuel mixture inlet tube is tappered like a funnel. The pump rod is an early version also. The tank legs/trivet supports are made of shaped brass rod(not steel).