WWII Occupation - Alsace (Elsaß) Hindenburg Overprints MiNr. P1 MiNr. P2 These cards are Third Reich MiNr. P225 I and P226 I overprinted for use in German-occupied Alsace. Set Date(s) 15 August 1940 Hindenburg Overprints MiNr. P1 MiNr. P2 These cards are Third Reich MiNr. P225 I and P226 I overprinted for use in German-occupied Alsace. Set Date(s) 15 August 1940