cover 1870 and 1871 official entire letters, all originating in Chalons sur Marne and showing on reverse flaps fair to good strikes of the "ETAPPEN=COMMANDANTUR/(eagle)" handstamp in blue, also 1872 similar entire letter showing a fair to good strike of the rare "KÖNGL.PREUSS.BRANDENBURGISCHE/(eagle)/KÜRASSIER.RGMT/(NO.6 ) K:NICOLAUSI/VON/RUSSLAND" handstamp in black.