The Seiko 4N00-1380 is a slim (2.45mm) self-winding mechanical watch movement used by renowned watch brands like Audemars Piguet, Vacheron Constantin, and Patek Philippe. This movement incorporates a suspended barrel and features manual finishing of the bridges, including polished bevels, satin-brushed edges, and Perlage on the recesses. It operates with automatic winding and is equipped with KIF shock protection. Additionally, this movement is designed without a second hand.