This is a TSC AMERICA torsion spring, part number 32-0500009-30LF. It is designed for light-duty applications with a 0.9mm wire diameter and a black finish. The 'L/SWP' designation likely indicates specific loading or winding properties for its intended use.
32-0500009-30LF - Tsc America TSC, TORSION SPRING/L/SWP 0.9MM, BLACK