Please help identify which replacement balancer I need

A home owner from Richmond, Virginia says:
Good Morning,
I'm hoping you can tell me which balance you manufacture that I can use as a replacement. It looks like a block and tackle system. The top of this is connected by a thin rope to the top of the window frame. If you have any questions, please ask. The window weights approximately 18 lbs.

User submitted image of their window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Hello, Randy. Please see our Series 850 balance, I believe this is what you want.
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