This is an awesome dioptric scope from Van Cort Instruments, Inc. It is branded on the brass ring around the lens "Van Cort Instruments. Inc. 1987 Dragonfly" assuring its authenticity. By holding it to your eye and turning it you will see multiple, revolving images of whatever you are pointed at. Nicely crafted birch. A wonderful gift for someone or another great addition to your Van Cort collection. Comes with original box adding to its vintage value. Approximately 2 and 1/4 inches (6 cm) long.