Doesn't look like anything I ever saw Stanzel put out. It resembles their Shark but it isn't that design. I have a video of the Stanzel history that I'll have to watch and see what it has. I can't see the controls but if it has a bell crank in it, then it's not a Stanzel product. They were pitching their monoline system in competition to the Jim Walker American Junior "U-Control" bell crank and pushrod system. The Walker patent was in effect at that time, and kits usually didn't include anything for controls or mentioned the term "U-Control" or they would have to pay Walker a royalty. He had a patent on the system and the term "U-Control." Plans in both kits and magazines just called out for the builder to "use your favorite control system." There were all kinds of contraptions used to try and control the elevators or flaps on the wings. I had an old kit of the Comet "Lil Schmoe" 1/2A model that had a sort of bell crank mounted right at the wing tip and a wire push rod that traveled through a curved length of small diameter aluminum tubing to the elevator. Carl Goldberg designed a model for Top Flite called the "Whizzer" that used flaps on the wing to sort of control pitch to by pass the Walker patent. I think there is lots more info in Dave Thornburgs book, "do You Speak Model Airplane."
Type at you later,
Dan McEntee