Württemberg, 1863, 18kr orange. Tied by "Wildbad, 22/5, 66" cds on cover to Oxford, England, red manuscript "10" beyond the border rate, red London entry cds's and reverse with various transit and receiving postmarks, Extremely Fine and choice, a very scarce single franking usage to England; with 1986 Bühler certificate. Scott No. 40. Michel No. 29; €2,200 for single franking ($3,014)  Estimate $400 - 600. $0 (Image)