WWII Occupation - Luxembourg Luxembourg Overprints MiNr. P6 MiNr. P7 MiNr. P8 These cards are Luxembourg postal stationery overprinted for use in German-occupied Luxembourg. Set Date(s) 5 December 1940 Luxembourg Overprints MiNr. P6 MiNr. P7 MiNr. P8 These cards are Luxembourg postal stationery overprinted for use in German-occupied Luxembourg. Set Date(s) 5 December 1940