Please pay close attention to this description. This is a near pristine condition Canon IV SB2. However, there is a spring in the winding mechanism than is damaged and in need of repair. I believe it to be part 3064, which prevents the advance from turning back on itself. The result of this is inconsistent spacing between frames. I'm not sure if one can be fabricated or would need a donor. Other than that the camera is in fantastic condition. I recently used it on a holiday, even with the damaged spring. I wouldn't buy this though if you don't mean to send it for repair at some point. Don't let this beautiful camera go to waste!