Casey from SWISCO responded:
November 14, 2018
Hello, It looks like you have either our S351-29, with a 15-002 bottom attachment, or S390-29, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to know the weight of your sash in order to choose the correct option if there's no stamp number on your balance. Thank you! Comparison of 15-001 & 15-002
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