28 inch channel balance

A home owner from Myrtle Beach SC 29588 says:
this is a pennco window
The only markings on the balance is 12/2
Unique 27-c-30
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Bob from SWISCO responded:

Can you show me the bottom fitting or attachment on these balances? We'll do our best to ID what you have from there. 

A home owner from Myrtle Beach SC 29588 says:
Sorry did not see your response
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Bob from SWISCO responded:

Thanks for getting back to me. This looks like an S770-28 with a 62-105 Hook attached on the bottom, which usually connects to a pivot shoe like the 15-208. We've seen this setup with Pennco windows before. We can custom make these balances with that hook attached for you. Our stamp ratings are a bit different than what your old balance used; we would use a stamp option of 28C for the balance, which means it would be meant to support a window sash in the weight range of 18 through 23 lbs. Does that seem right to you? Also, how many balances do you need? From there, I'll get a quote written up for you. 

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