Paul from SWISCO responded:
May 18, 2016
Hey, Jim. You will need to weigh your sash and refer to the chart shown on our S380-23 store page. Stamps ending in "9" or "90" like yours use an old rating system that is no longer produced. However, one of our standard options should work. If your sash is heavier than anything we show, let me know and we can work from there.
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