Double hung window regulator

Hello there. I suspect you need the 24-737 Andersen Balance, as this will replace old Andersen balances with the stamp 7#27, or 727. That last '1133' could refer to a different part, but it's not clear to me in the photo. Could you check the other balance box from this window to see what the stamp states? That should help clarify. Thanks.

Even just a clearer photo of those stamps in the bottom corner might suffice. How they are printed sometimes matters as much what they say. If you want we can start with that before resorting to taking apart the window again.

This all comes down to what appears more significant: the 7p27 or the 1133. That will give us the answer.

Thanks, that helps a ton. That actually reads '7p27 1183' to my eye. 1183 is not an identifier stamp and isn't important. Therefore the important stamp is the 7p27, or 727--which means you can use the 24-737 Sash Balance. Let us know if you have further questions!