The Seiko 6606-8971 is a mechanical watch movement that incorporates several key functions. These include an adjustable stud holder, which allows for precision regulation of the movement's rate. The movement also features shock protection, which enhances its durability and resistance to external impacts. Additionally, the Seiko 6606-8971 includes sweep seconds functionality, enabling a smooth and continuous second-hand motion. Lastly, the movement integrates a calendar feature to display the date.