The Mido 917P is a mechanical watch movement that was produced between 1950 and 1954, with a total of 11,760,102 units manufactured during this period. It is the first automatic movement developed by ETA, featuring an adjustable rotor-bearing clearance. Additionally, it offers the option of a power reserve display, allowing for a power reserve of up to 40 hours. While there may be similarities between the 1256, 1285, and 1286 movements, the specific differences are currently unknown. Notable functions within the Mido 917P movement include automatic winding and a sweep second hand.