SALZMÜNDE 18 / 6 (1866), OPD Merseburg, box cancel of 2 lines S.O.T.N on 1 Sgr. as a single franking on to Salzmünde addressed cover. Probably it concerns an a retroactive cancellation, since the letter at the 17.06.1866 in Halle written was, reverse issue cancel from 18.06.1866