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

Excellent 3rd patternLuftwaffenavigation disc orDreieckrechner DR3 Tpcomplete with the cardboard box in unissued condition.This example is nicely markedFL. 23 825, gwr, Nov. 1944.The 3 letter codegwrindicates production by an unknown manufacturer in November1944. 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 theLuftwaffeissued flight maps. These navigation computers were used byLuftwaffepilots in almost every German aircraft such as theMe109, Fw190, Me262, He-111, Do-217, Ju-88and almost all others! Excellent and very rare Dreieckrechner DR3 Tp with its original box which is impossible to upgrade!