The Benrus AR1 is a mechanical watch movement that was manufactured in approximately 1935. It features a bimetallic screw balance and is known to belong to a series of movements numbered 71, 73, 75-80, 144, 166, 167, 203, 205, 216, 219, 240, 244, 255, 268, 284, 286, 287, and 326. The movement offers manual winding and includes a sub seconds function.