Does anyone have information about antique 16mm Keystones?

My boyfriend bought me an old Keystone 16mm A-15 movie camera for my birthday. It's in perfect shape, it comes with 4 lenses, works perfectly, and has all the camera manuals from when it was originally purchased. The only problem is I can't find any information on this exact camera. Really, nothing. There is tons of information on other models of Keystone cameras made around the same time, but none on this model. Does anyone know where I could find information about it or know someone that I could ask?