Tom from SWISCO responded:
January 24, 2018
I agree, the Series 377 looks close. This comes with the 19-018 top and 15-005 bottom. As long as those match you should be okay. If they differ in any way, though, let me know exactly how.
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Paul from SWISCO responded:
February 19, 2018
Yes there is. Your stamping of "23-3" should correspond to our 2330 which holds a sash weight of 15-18 pounds. If you want to be 100% certain that is correct, you can always remove your sash and weigh it on a scale to see what you come up with.
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