Paul from SWISCO responded:
July 20, 2016
Hard to make out the depth of your bottom balance shoe. You could have either our Series 390 or Series 351 depending on its size. Look them both over and see what you think.
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Tom from SWISCO responded:
July 22, 2016
A stamp of 37B usually corresponds to our 3720 option. I wouldn't recommend guessing your sash weight, these are delicate systems and it's important to only get the option that matches your weight. If you want to be 100% sure, I would remove the sash from the frame and weight it on a scale.
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