1872, Front of letter in "double Franco-German port" from Mulhouse (Alsace Lorraine) to Paris, mixed franking at 2 groschen with Brustschild Mi-Nr. 5 postmarked 17 January 1872 corresponding to the port in German territory, then 25c with Napoleon 5c Y&T n°20 + Bordeaux 20c n°45 postmarked PC 420 for the French part (domestic tariff of 1 September 1871), rare very late use of a Napoleon non Lauré and a Bordeaux in Alsace, Roumet certificate, ex Walske collection, VG.