Unissued Luftwaffe flight navigator disc or Dreieckrechner DP3 Tp in original cardboard box

Excellent 3rd pattern Luftwaffe navigation disc or Dreieckrechner DR3 Tp complete with the cardboard box in unissued condition. This example is nicely marked FL. 23 825, gwr, Nov. 1944. The 3 letter code gwr indicates production by an unknown manufacturer in November 1944. This is the rare 3rd pattern which is made out of yellow tinted illuminating synthetic resin material for clear view at night flying and/or low visibility, same idea as with the Luftwaffe issued flight maps. These navigation computers were used by Luftwaffe pilots in almost every German aircraft such as the Me109, Fw190, Me262, He-111, Do-217, Ju-88 and almost all others! Excellent and very rare Dreieckrechner DR3 Tp with its original box which is impossible to upgrade!