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Paul from SWISCO responded:
November 12, 2019
Take a look at both our S385-25 and S380-25 channel balance. We feel one of these may work for you. The only difference between these two balances lie within the depth of the bottom balance shoe. The depth measurement of the bottom shoe for the Series 380 is 1" and for the Series 385 is 1-3/32". You will need to measure the depth of your bottom shoe, like in the diagram below, to determine which balance would work best. Since your stamping does not match any of our stampings, you will need to weigh your sash on a scale and refer to the sash weight chart located on the product page. 
Alternate view of 15-004
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