The A. Schild 1978-2 watch movement is an open face calibre movement that features a Breguet hairspring. It is optionally equipped with Reed's regulator. The differences between the A. Schild 1978-2, 162, and 165 are not known. The movement registers list only the open-face variant of the Felsa 161, while Ronda additionally includes the A. Schild 1978-2, 162, and 165. The A. Schild 1978-2 movement includes functions such as stem wind and set, sub second, and was commonly used around the year 1932.