Broken balance

A quick learner from Florida says:
This is one broken balance, I also have another window,larger with the balances removed prior to my ownership
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Emily from SWISCO responded:

Hi there!

With this combination of attachments, you could have either an S380-29  or S385-29  channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. Can you tell me the stamp on your metal channel? I can't quite see what yours says.

Thank you! 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A quick learner from Florida says:
28-B USB
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Emily from SWISCO responded:

Thanks for confirming that for us. A stamp of 28B usually corresponds to our 2820 option. That said, you can always weigh your sash on a scale to be 100% sure.

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