Window Balance

A professional from Neenah, WI says:
I am looking at the S770 window balances and I am wondering which stamp option to order. The only markings on my balance are 2819DS followed by a smaller DK and there is a faint B.S1 also stamped in it.
Thanks for your help,
Joe
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Tom from SWISCO responded:
Hey, Joe. I'm not sure, either, actually. Can you tell me how much your sash weighs?
A professional from Neenah, WI says:
I will not have a scale till tomorrow but I believe the weight is between 50-70lbs.
A professional from Neenah, WI says:
I was able to weigh the sash this morning, my estimated weight was off, it is 38.6lbs.
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Tom from SWISCO responded:
That is very, very heavy. I think it would be best at this point to know the exact weight, just in case.
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