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Emily from SWISCO responded:
September 30, 2021
Hi there! Thank you for your patience during our busy season. It looks like you have either our S351-22, with a 15-002 bottom attachment, or S390-22, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. The stamp on your metal channel is a bit odd. We don't have a stamp option of "2116" for these balances. We recommend weighing your sash on a scale to determine the appropriate stamp option. There's a chart on the S351's and S390's store pages that will tell you which option you'll need based on the weight of your sash. If you have any questions just let me know! 
Comparison of the S351 and S390 balance shoes.
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