Following the previous post on vintage pencils, Bob from Brand Name Pencils sent some correspondence. Bob owns a complete set of Eagle Polytechnic pencils from the mid 19th century, and was kind enough to share some images.
The box notes that the pencils were patented April 3rd, 1860.
“Adapted to the use of schools and colleges,” the seven pencils range in grade from HHH to BB:
Berolzheimer, Illfelder & Co.:
Note that unlike the A. W. Faber pencils, the narrow side of the rectangular lead is adjacent to the glued internal side of the pencils:
The Polytechnic seems to be a direct competitor and response to the Polygrade. This particular set has survived in amazing shape.
My thanks to Bob for sharing these images.