Directional Gyro, Electrical, Luftwaffe Fl22561 Kurskreisel AT-6 This type of gauge was

This type of gauge was the primary tool used to lean the large radial engines in service late in the piston-powered aircraft era

since the decals on the letter opener state "Standard Steel Propeller" and not "Hamilton Standard"

25in diameter and ~4in deep

The cabinet design appears to be repurposed from that used by the Fl22861 Altitude Recorder/Barograph

25in diameter and ~8in deep

Directional Gyro, Electrical, Luftwaffe Fl22561 Kurskreisel AT-6 This type of gauge wasThis is a WWII era Directional Gyro Fl22561 as used in bombers Dornier Do 17, Junkers Ju 88, and night fighter Bf 110 of the German Luftwaffe. According to our friends at DeutscheLuftwaffe. DE, this instrument was part of the Siemens K 4 course control system, and could be used as a stand alone course display system, and in conjunction with the PKS 11 patina course controller and the PDS three rotor control system. With the left knob depressed, the