Sash balance for 52" wide by 62" high

Thanks for posting. I'm a little confused. While I agree this balance appears to be a Series 770, that stamp code of 25DS39 you show in your last picture would suggest this is not a 16" balance; it would also be a very unusual stamp for this type of balance. Can you confirm that stamp is on this balance? Can you also confirm the metal channel length? We'll do our best to narrow this down from there. 

The best thing to do, if you haven't already, is to weigh the window sash. If you can tell me that exact weight, we'll be able to choose the correct stamp option for a S770-16. 

Sorry, let me clarify. The window sash is the movable part of the frame with glass. I am certain this weighs more than 0.8 pounds. If you could obtain the exact weight, perhaps by placing the window on a bathroom scale, I can further narrow down what you need. 

We're getting there. 36 pounds is awfully heavy for a 16" balance. Can you please double-check the length? Be sure you are measuring the metal channel, not the inner components. I only ask because, looking back at your original photos, the balance looks a lot longer than 16". Let me know and I'll try and wrap this up ASAP. Many thanks. 

Thanks for your patience. I just sent you an email with a custom link to order a pair of these 26" Series 770 balances, stamped 25DS39. This stamp indicates the balances are calibrated to support a sash of 39 pounds. While this not the weight you reported, we generally always go with the original stamp rating unless there's a good reason not to. Did you ever have trouble closing these windows or keeping them closed before the balances failed? If not, then I'm confident the original stamp will work well. 

Let us know if you have any other questions, or need a different amount, prior to placing this order.