Tom from SWISCO responded:
July 27, 2016
This looks a lot like our S395-28, based on your nylon attachments. I'm not sure about the stamp, though. Stamps ending in "90" use an old type of rating system. One of our existing options could still work, but you would need to weigh your sash on a scale to confirm which. We have a chart on the S395-28 store page that tells you how much weight each option can support.
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