Not 100% sure what this is. Someone suggested it was a portable oil heater used in cabooses or observation cars, but I always thought those had small wood or coal stoves in them, so I'm not sure. Definitely old. The brass tank is no longer what I would call "sealed" as it has splits from age the way brass gets.
Not polished or cleaned.
About 11" across at widest.
Handle, caps, burner, fuel gauge... not sure what might be needed here so let me know. If I can easily remove it and ship just that you can save a lot on shipping.