Need replacement Coil Balance

Thanks for reaching out to us! Your coil balance assembly reminds me of our Series 210 Roller-Tilt Balances. To confirm if this is the correct replacement, you'll need to remove the assembly and carefully compare the dimensions below. 

Since your housing appears to be stamped with a 6, I believe you'll need the S210-06. Although, you may want to confirm that the sash does weigh 12lbs.

Alternate image for S210-06