Channel balance
Thanks for reaching out! I've narrowed these balances down to a few possibilities. To confirm the exact replacement, out of them, the last thing I'll need to see is a photo of the spring side of the channel balance.
Please let me know if you have any questions!
Thanks for the additional photos. Your window balances can be replaced with either the Series 380 or the Series 385. . To determine which of these is the best option, you'll need to measure the depth of the bottom shoe.
I'm not able to read the stamps from your balances because they're a bit faded. At first glance I believed they showed a 32, but the longer I look at the them, I'm unsure. That said, you'll need to be sure to confirm the length of the metal channel and the stamp from the channels.
If I am correct, you'll need the 3230 stamp option for your balances. This will support a sash weighing between 18 to 23lbs. Please let me know if it differs.