non-listed channel option stamp

A landlord from Portland Oregon says:
My landlord friend has a 24" broken channel balance with "23 9 CQ CALDWELL" stamped on it. What channel option for 24" Series 377 Channel Balance Product Code S377-24 should be ordered please (2310-2350 listed)?
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Tom from SWISCO responded:
23-9 doesn't match any option we have, I'm afraid. Your best bet is to weigh your sash on a scale, then reference the chart we show on the S377-24 store page. That shows you each option and how much weight they can support. If your sash weight exceeds all the options shown, then tell me what it is and we can try to work out a solution.
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