4 s. brown ochre, as a single franking on cover envelope, with K2 "KEEL 13.7.66" over travelling post office Hamburg-Berlin to a lance corporal of the 1st Comp. the 5th Laurenburgische's infantry regiment no. 48 in a reserve hospital in Berlin, envelope little traces and the lower corners round. An interesting document from the time of the German-Austrian war 1866 (clashes June 23rd until July 26th, 1866)