Horizontally sliding, metal windows

A home owner from Aurora, IL says:
I think this could be 55-158-6, but not sure it matches exactly. I can't find the manufacturer identified anywhere on the windows, that I can see.
User submitted photos of snap-in glazing.
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Paul from SWISCO responded:
The 55-158-6 is similar, yes. It may be the best match we have. The leg is 3/8" long on ours. What is yours?
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