Sistem51-M HM

The SISTEM51 Manual-Wound is a hand-wound mechanical movement engineered by Swatch for the Audemars Piguet × Swatch Royal Pop collection. Based on the automated SISTEM51 platform, this version features central hours and minutes, 15 patents, a Nivachron balance spring, and laser-adjusted precision with a 90-hour power reserve. It includes a unique barrel drum power-reserve indicator, appearing grey when the mainspring requires winding and gold when fully wound, visible through a transparent case back.