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Emily from SWISCO responded:
April 25, 2023
Hello there! Thank you for reaching out to us. Our Series 775 appears to be a match for what you have here. Your stamp is a bit odd and doesn't match any of the listed strength options, however. I recommend you weigh your sash on a scale to determine the proper option for your replacements. There's a chart under the product description on the S775-30 store page that will tell you which option is best based on the weight of the sash. |
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Emily from SWISCO responded:
April 26, 2023
What you want to measure is the width of the shoe in your first photo. I'll also attach a photo below you can use as a reference. 
Close up view of the bottom of the Series 775 sash support balance.
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