Airplane Windows..

Bought two airplane windows.  One is kinda trapezoid shape and the other one is closer to a rectangular shape.  They're made of glass an very thick (about 3/4 in) & heavy.  There's markings on the edge of the glass indicating that they were made in 1964.  There's several markings that look like part numbers, lot number and possibly inspection confirmations.  Don't know what plane it's from...  Will be tough to figure out...