Tom from SWISCO responded:
January 16, 2015
I'm not sure! That is an odd stamp. First, I see you were looking at our S385-25. Are you positive that this is the part you need? If so, you can simply weigh your sash and compare it to the chart we have posted on the S385-25 store page. This is the simplest and most direct way to determine what SWISCO balance option is best for you.
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