Cast from an aluminum alloy and covered with leather, the Mercury was not only unlike anything Universal had offered before, it was actually a revolutionary achievement. Important features worth noting include the unique rotary shutter (responsible for the circular protrusion on top of the camera), capable of extremely accurate speeds up to 1/1000th of a second. Additionally, the Mercury was the first camera to have internal flash synchronization triggered by direct contact with the foot of the flash unit, known today as the hot shoe. This camera is in decent shape and is working - ...