I do not know the brand of this balance but I need two, can you help?

A handy person from Rock Hill S.C. says:
29 inches long, 1/2 inch deep and a 1/2 inch wide

markings 2900 BSI LD
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Good morning, and thanks for these clear images. I think you might want to take a look at our S770-29 channel balance. How does that look? I'm not as sure about the stamp option, though. I recommend that you weigh your window sash and compare that weigh to the ratings shown for the various S770-29 options to see what works.
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