The VTG Gilson circular midget slide rule from 1931 to 1936 is a compact and collectible tool that originates from the United States. With a diameter of 4 1/4 inches, this slide rule comes with a leatherette case for convenient storage and protection. Perfect for engineering and scientific calculations, this vintage piece is a nostalgic reminder of mathematical tools from the past, making it a valuable addition to any collection of slide rules or antique scientific instruments.  It appears to be in very good condition.