Balance Identification

A quick learner says:
Window Glass dimension is 24" H x 32 3/8 W, Double-Pane

Andersen Corp (Bottom Side 11600-17, Top Side 11600-3)

Stamp E45 9?27 7-86 (? could be a 7 or / or 4)
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Tom from SWISCO responded:
I recommend our 24-939. This can replace Andersen balances stamped with 9 27. I think the "?" might be a superfluous mark in this instance.
A quick learner says:
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