This will be for a single hung, non-tilting sash. Only identifying marks are 2790 30. The metal portion of the channel is 1/2" wide, 28 1/16" long. The attachment that hooks onto the window frame is a tab with a triangular hooked tip. Looking through the catalog, it appears to be a Series 351, but the bottom shoe on mine measures 1 1/16" between the 351 and 390 series'. Any help is greatly appreciated.
- Justin
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Casey from SWISCO responded:
February 13, 2023
Hello, If the depth of your bottom fitting is more than 1", I would recommend the S390-28 since the fitting can wear down a bit over time. You could also check the depth of a balance fitting from another window to confirm. You'll also need to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight. Thank you. 
Comparison of the S351 and S390 balance shoes.
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