Paul from SWISCO responded:
December 2, 2011
Thanks for posting! It looks like you have a Series 390, but the S in your stamp certainly is puzzling. If you remove your sash from the window and weigh it, though, I would be able to tell you the best stamp option.
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Paul from SWISCO responded:
December 2, 2011
I'm sorry, but we will need the weight of the sash, not the balance. Please refer to our Guide on Installing and Removing Channel Balances, the first half of which tells you how to remove the sash from your window. Please make sure to give us the weight in pounds.
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Casey from SWISCO responded:
December 5, 2011
Thanks for the information. It appears that you will need a S390-18 with the option 1750.
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