Austria, 1863 Double Eagle 15kr yellow brown. Perf 9½, tied by bold strike of "K.K. Feldpost, No. 1., 10/3" cds on 1864 cover to Vienna used from Kolding, Denmark paying the Austrian domestic letter rate for distance over 20 miles, reverse with arrival postmarks; stamp with a couple nibbed perf at right, otherwise Very Fine, a rare 1864 wartime rate usage, from May 20, 1864 letter sent back home from Austrian field post did not require any postage. Michel No. 34. Scott No. 26  Estimate $2,000 - 3,000. $0 (Image)