In the 1930's Parker Pen Company produced convertible fountain pens and mechanical pencils. Here I'm showing a short jade vest pocket pencil that converts to a long-stemmed desk pencil. A second example pictured of this combination is a senior size Parker Streamline pencil in a black and pearl pattern. The last picture better shows the sizing of the various pieces (pencils 6th and 7th from the top). For sizing descreptivity (yes, my word) the box dimensions arrive at 6 by 8 inches. The converted desk pencils would be fitting into a base and holder - likely with the associated fountain pen.