Broken spring

Thanks for reaching out! Your window balance can be replaced with either the S351-22 or the S390-22 Channel Balance. You'll need to measure the depth of your shoe to confirm the correct series.

Comparison of the S351 and S390 balance shoes.

I'm not able to cross-reference your stamp with those on our replacements, so you'll need to confirm the exact weight of your sash. There is a chart below the product description of the balances that lists the weight ranges each stamp can support.