Württemberg, 1862, 3kr light brown, Helfferich postal entire essay. 142x78mm, embossed Coat of Arms indicia with latin letter "Neun Kreuzer" imprint, addressed to Vaihingen with "Stuttgart, 10 Mai, 1864" origin cds, blue "6" kreuzer penalty rate crossed out and reverse with notation "The letter not to be sent per Train #4"; light vertical fold and some minor edge wear and soiling, small portion of backflap missing, F.-V.F., an extremely rare usage, this being the only known used Helfferich essay on record; with 1978 Thoma certificate. Estimate  $2,000 - 3,000. $0 (Image)