2 pint 3 legger made < 1919 as far as can tell. Before they sold out to Optimus. Came like this Note Burner and the pump cap are NOT original but the rest seems to be. Has a very deep intent in the primer cup. maybe it was a silent stove but the ones I tried where to long for this too be. Maybe they where a little squatter who knows. Anyway enjoy the pics. Looks like 11 or W or M 1911????