Window balance.

A handy person from Florida says:
37 inches long by 1/2 depth.
3650 stamped on it.
User submitted photos of a window balance.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I would start by looking at our S380-37 channel balance with a 3650 option. Keep in mind that this balance comes with a 19-005 top attachment and 15-005 bottom attachment. It's important to make sure these pieces match up to what you have now.
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