A home owner from Buffalo ny says:
April 17, 2016
Hello I am looking for what u believe is the sash of a unprimed window. The first picture is the part I need that says 2830 on it. It is from the sister window of the one that is missing this part. Any assistance would be greatly appreciated
Paul from SWISCO responded:
April 20, 2016
Thanks for posting! It sounds like you need a new replacement balance. However, I cannot identify it based on just the stamp. All that tells me is how strong the spring is, not what the Series is.
That said, it appears you have a Seasonall brand top sash guide in your third picture, like our 18-110. This leads me to believe it's a Seasonall brand window, which has been known to use our Series 390 channel balance. I recommend carefully looking over the pictures and information we have for this hardware to confirm that the Series 390 is a match. Make sure to take special note of the nylon attachments on either end.
It also looks like your window lock in the second picture is broken. See our 90-402 for a possible match, if you need it.