Window channel balance and pivot shoe

I agree, our Series 770 looks like a great match. Your stamps are a little peculiar, though, and not like how these balances are usually rated. I think you're going to have to remove your sash from the frame and place it on a scale to get the weight. We have a chart on both the S770-29 and S770-25 store page that tells you how much weight each option can support.

Should any of our options be inadequate to support your sash weight, let me know and we can do our best to find another way.

Thanks! So, for two 25" balances supporting 15.4 pounds, I recommend the 25B option. For two 29" balances supporting 21.8 pounds, I recommend the 29B option. You can cross-reference these weights on each balance's store page, as I mentioned.

That shoe looks like our 15-129. I'm confident that this is what you want but you may want to look over our dimensions just to be 100% sure.