I need help to identify this one. It's not a Kliegl 1143 or 3440 nor a Strand Patt 750 neither an altman 660. It has a 1K mogul screw bulb , I think it could support a 2k The front swing open in the middle to insert a round 16" gel frame. I dismantled one to clean it and change the Asbestos wires and theres is not a single marking. The wires where attached to the body with a plastic insert, it my help average the time frame. This plastic knob my be the clue. I can't figure where I saw this kind of knob before. Any clue will be welcomed.