Cuervo y Sobrinos CYS 5121

CYS 5121 is an automatic movement manufactured by Cuervo y Sobrinos, based on the Sellita SW200-1 with CYS-specific modifications. Introduced in 2020, it remains in production and serves as the base for the Historiador Hemingway line. The movement is not in-house, utilizing the established Sellita architecture with modifications applied by Cuervo y Sobrinos.