Windows balance

Hello there!

It's hard to say what you have from these photos. It looks like there's some type of shoe still in the jamb in your last photo but I can't make it out. May I see a closer photo of it? 

Thank you kindly for getting back to me! My first thought was the Series 751 as well once I saw the knife lock shoe in the jamb. Your stamp is a bit odd and doesn't match any of the listed strength options, however. I recommend weighing your sash and referring to the chart under the product description on the S751-33 product page to determine which option you'll need for your replacements. 

The 26-150 is often used with the Series 751, yes. However, the best match depends on your original pivot bar.