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Paul from SWISCO responded:
June 5, 2019
Thank you for your post. Please take a look at our S380-34 channel balance. To make certain this is the correct balance you need, measure the depth of your bottom balance shoe and compare it with ours. If everything matches up, then you should be good to go. as for the stamping, your stamp corresponds to our 3350 which holds a sash weight of 28-32 pounds. However, you mentioned that your sash weighs 25 pounds. If that is the actual weight then that means the 3340 stamping would make the better option. I would ask to reconfirm the sash weight to see which stamping would make the better choice. 
Alternate view of 15-005
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