I have never come across this model. I have seen a few Supernovas and BUs, and the later Lydia. A web site dates the 565 to 1962, is that before or current with the Lydias
I don't mind plastic gears too much, since some of my favorite models have them and they have prooven to be tough and durable models (Bernina and Elna). I know Necchi Lydia has problems with a part in the bobbin winder and can have cracked cam tack, all plastic parts. The replacement parts are in plastic too, and I don't know if they are of better quality than the original.