Channel balance

Thanks for posting. This looks like either an S380-27 or S385-27 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare both with your old hardware to see what matches best.

Comparison of the S378, S380 and S385 balance shoes.

You'll then have to choose a stamp option, which designates the strength of the balance. Your old balance's stamp does not correlate with any of the stamps on our list. To know what stamp to select, weigh the window sash these balances support. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under either the S380-27 or S385-27 shop page.