1930s, 40s Brass & Copper 1 Gal Fire Extinguisher, \"FIRE GUN\", American LaFrance For Sale

Here is a vintage 1930s, 1940s, back pack small fire extinguisher marked; No.4, 1 gallon, Fire Gun, by American LaFrance Foamite Corp. The pump and valves still open and close, air pressure had built up and came out when I opened the small valve! The nickel plated pull up lever is stuck, I did not try to force it! The extinguisher is all brass and copper except the pump handle, housing over the gauge, and the center back plate that holds the large name plate. Notice how small the nozzle and brass covered hose is; less than 1/2\" across! The carry straps have disintegrated. It measures about 21-1/2\" high by 11-1/2\" by 4-1/2\". I was told this was used by the Forest Service in Northern Minnesota. The photos are of the actual item offered.