EXTREMELY RARE WWII German Luftwaffe Reflexvisier Gunsight Navi 3 Fl.52480. Navi 3 used in conjunction with a stopwatch and the accompanying table to determine a lead angle for the bombing. Was used in the Ju 88 and in the Siebel Si 204. In these types of aircraft, the navigation system was built into the nose of the fuselage. The Navi 3 was used in conjunction with the "hold-up disc rule for Navi" Fl 52771. This RARE item is working condition.