This is an original Incomplete WW2 USAAF Type T-1 Bombsight-Sighting Head and is Based on the RAF Mark XIV Bombsight. This sighting head was made by A.C. Spark Plug in 1943. This sight was used starting in 1942 in aircraft like the B-24, B-25, Lancaster and Mosquito Bombers. This unit is in very good condition with damage. This is the sighting head only and it is missing the arm that extends upward from the sight. See attached photo. I do not have the missing piece. In addition this is just the sighting head. The rest of the bombsight is a large rectangular mechanical computer. This item is 14  x 10 x 14 inches. This item is being sold as a collectible. Payment should be received within 10 days of auction closing unless prior arrangements have been made. Buyer to pay actual shipping.  Thanks for looking at my auction.