I was fortunate enough to have the opportunity to pick up this PQ at the flea market for a decent price a while back. I believe, judging from the old catalogs that this Air-O-Lite PQ was produced in 1916. At some point in its life, the fuel valves were replaced with much later Leacock valves.
That’s quite something @MantleMonger especially with those shades. One of these chandeliers sold just recently in the UK, I was tempted to go for it but in the end gave it a miss.
It definitely throws off some good light. It was advertised as a 600 candlepower unit. Since the burners are on opposite sides of the fount, it doesn't cast a shadow below either.