Andersen double hung Windows

A home owner from Pentwater MI says:
Has the number 11 then 80/0 and XI on the window. Also sash balance has number D44 7P27 377 stampoed into housing.
Can you help with date and replacement part number?
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Paul from SWISCO responded:
Based on your stamp of "7P27," we recommend our 24-737 Andersen sash balance. The insulated glass was made by LOF in 1980, I believe.
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