Tom from SWISCO responded:
November 2, 2016
Thanks for posting. That is a peculiar stamp. I'm not sure what would match. You were looking at our S770-30 channel balance, though. Is that what you need? If so, we have a chart on the S770-30 store page that shows you how much weight each option can support. All you need to do is weigh your sash on a scale, then reference that chart.
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