The Otero 900 is a robust mechanical watch movement designed for automatic timekeeping. Introduced in 1969, it boasts a low-profile design and a relatively large balance. Notably, this movement features integrated winding gear, eliminating the need for external attachment to a manual-wind calibre. The Otero 900 supports various functions, including sweep seconds, a quickset date feature, and a hack feature. Additionally, it incorporates a micro adjustable regulator and a calendar function. This movement has been in use since its introduction in 1969.