WWII Aircraft Octant, US Army Air Corps, cased

I am selling for a friend an aircraft octant that his father used in a bomber in WWII. It is a navigation device used during the night. It appears in great condition and has even the original leads and extra bulbs inside the wooden case. I took lots of pictures for you. I assume it could used today as well as then for night time locations just in case your GPS fails. Buyer to pay 15.00 s&h.