Replacement channel balance

A quick learner from Florida says:
The string on my balance broke and I am looking for a replacement. I cannot seem to figure out which would work best. It is 1/2" x 28". The markings say 2712 BSI RE. Can you please recommend a replacement?
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Start by looking at our Series 390 channel balance, I think this could work for you. I'm just not sure about that stamp. Can you confirm the weight of your sash?
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