This antique copper mounted on wood PRINTING BLOCK shows, inside a circular cog, a car, plane and bulldozer in beautiful detail and says "WORKERS OF AMERICA" "International Union United Automobile - Aircraft - Agricultural Implement" "Aug. 26, 1938".  This small beautifully detailed printers block measures 3/4" tall x 3/4" wide x with the standard 15/16" of an inch "type high" thickness.  With the right equipment and ink this printers block can still be used to draw prints from.  It also makes a great collectible piece of history.