6901-178 AERO INSTRUMENT CO pelorus drift sight IOB. Designed to take bearings on objects or measure the angle between heading and the track of an airplane. Consists of a small scope with bar that inserts into base with scales. Base is in pasteboard box with about 50% label, and both it and the telescope are inside a wood fingerjointed box with sliding lid. Some tarnish to brass rod, otherwise in pretty good shape. Good (HSS168) 40 - 80 ~~ INITIAL BIDS must be placed by end of the day on Saturday, September 14, 2019. PLACED BIDS may be raised until 10PM EST on Sunday, September 15, 2019 by calling (800) 964-9036. To see current high bid, please call (800) 964-9036 between 10am-5pm EST as we also get bids via phone, mail, and fax ~~