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MrMonopolysBrokeSon t1_ixd6ols wrote

The 1960s was a transitional time for drywall, maybe you've got rock lath under drywall?

I second other's recommendations for toggle bolts or similar anchors if you can drill far enough to find the cavity. But if the overall wall thickness is only 3" that cavity might not be very deep - could be framed using 2x2 nominal lumber