Andersen Double-Hung Window Sash Balance

A home owner from Chelsea, Michigan says:
Side 1 Markings - Andersen Corp, Bayport, Minn and 11600-2 and D76 7#27 10 78
Side 2 Markings - 11600-3 and Patent 3146488 3335455
Length: Box 16 cm (6.25") Overall 17.2 cm (6.75")
Width: 7.5 cm (3.00")
Depth: 1.8 cm (1.75")
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Tom from SWISCO responded:
With a stamp of "7#27," I recommend our 24-737 Andersen replacement sash balance.
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