Dual coil balance with a 9 stamped on both coils. 2 screws mount it to the window frame, one through each coil
Emily from SWISCO responded:
September 12, 2023
Hello there!
Our 15-180 pivot shoe is my recommendation. Based on the stamp on the coil spring, I also recommend the 9-pound S190-940. Did you need the coil support as well? If so, see the 15-181.