This is a Lovely Vintage Crown 8 E3B Movie Camera, 8mm with its leather strap. Not sure how to operate it, however, all the three lenses are fix focus.You have just to adjust the aperture, according with the meter, and wind up the crank, that is about all I know.  Measures 6" high and 5" wide. It is in Very Good Condition and there are no scratches or marks on the camera, and the lenses all appear clear with no haze or mold. If you have questions about this magnificent camera I will do my best to answer them for you. Comes from a smoke free very clean environment. Thank you and Blessings :  )