American Seating Company School Desk Inkwell

Glass + Black Hard Rubber Lid. These are the real pig-tail dipping thing! Made by the American Seating Company. Some are marked "59" and some are marked "60" on the bottom of the glass, but dimensionally they are all the same size. 

The glass part depth is 1.14 inch. The pen hole in the top of the well is 0.443 inch diameter. They are made to fit into a hole that is 1 1/2 inch diameter with the lid above the surface. Alternatively the lid will still stop the unit from dropping through a hole measuring 1.86 inch in a more flush installation. The glass extends 1 5/16 inch below the black hard rubber lid. The screw-on lid includes a swinging closer.