"Pocket Astronomy and Pocket Planisphere" 1893
This is a miniature planisphere and booklet that was designed to be carried around in one's pocket. It was created by E. A Skinner and published by the Educational Novelty Company of Worcester, Mass. This is one of the smallest vintage planispheres that I have seen at four inches in width. The one side of the envelope has been chewed on by mice.