2801 stamped window balances

A quick learner says:
29 inch balance with 2801 lb stamped on it. 1/2 inch wide,non tilt window, looking for name brand of window.looks like S395 model
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Tom from SWISCO responded:
That stamp is a bit weird. Can you confirm what it reads? If you do have the S395-29, you can weigh your sash on a scale to confirm which one of our stamp options would be best.
A home owner from Sarasota says:
See picture attached. This is the number on the sash
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Tom from SWISCO responded:
That definitely says 2801. I'm afraid I'm not sure what that represents. What is the weight of your sash?
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