Window balance identification

Thanks for reaching out to us. We're happy to look into this. Can you also show us a photo of the inside of the balance's metal channel where the innerspring connects to the pulley mechanism? That'd be located in the middle of the channel. You may need to use an undamaged version as a reference. 

Yes, thank you kindly! Your balance looks like a match for the S380-33 or S385-33 with the 3230 stamp option based on what I see here. Measure the bottom shoe as shown below and see which ones matches up best.

Comparison of the S378, S380 and S385 balance shoes.