Anderson window balancer

A handy person from North Stonington, CT says:
BD 16 7#27 12-86 is stamped on the bottom. I assume the 12-86 is manufacture date. 11600-17 and 11600-3 are also stamped on the balancer.
User submitted photos of an Andersen window balance.
Profile picture of Donna
Donna from SWISCO responded:
Take a look at SWISCO product code 24-737, Andersen Perma-Shield Narroline double-hung window sash counter balance. This balance is used to replace balance boxes with stamp 7#27.
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