Paul from SWISCO responded:
October 26, 2016
Thanks for posting. Can you confirm the length of the metal channel? Based on your stamp, it should be 26", not 29". In the meantime, see our Series 385 channel balance. I believe this should match your Series, but carefully look it over to confirm.
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Tom from SWISCO responded:
October 31, 2016
A stamp of "25 4" usually corresponds to our 2540 option, but you can always weigh your sash to confirm.
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