Help finding balance

Question

Please help me to find the spiral balance. The measuring length is 28" and it has a red tip. This balance was installed in 1980. Attached are some pictures of it. Thanks.

User submitted photos of a window balance.

Paul · Accepted Answer

Based on your photos, it looks like you might have our S600-28. I would just confirm that the outer tube is 5/8" in diameter, like ours.