Window Spring marked with 26C USB
A quick learner from Temecula, CA says:
December 11, 2013
Tom from SWISCO responded:
December 12, 2013
Hey, thanks for posting. It's hard to tell what you have without seeing the top attachment. Does it have wings? If so, it may be our 19-005. If you agree, then I've narrowed this down to two possible channel balance Series: either our Series 380 or our Series 385 balances.
Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 380 uses the 15-005 while the Series 385 uses the 15-004. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.
A quick learner says:
December 13, 2013
yes, it has wings. I believe based upon the measurements you've provided that it's a Series 380.