Casey from SWISCO responded:
August 25, 2023
Hello, The channel balance shown in your photos resembles the S751-28. The 27REG stamp normally indicates that you would need a 27R strength option, which will support a window sash between 10-19 lbs. Take a look and compare the specifications of this balance to yours. Thank you! Close up view of the S751 balance top.
Close up view of the S751 balance shoe.
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