1898 Cape of Good Hope 4d registered envelope to Antwerp, Belgium, with a 2½d added and tied by a fine strike of the R.P.K. HEEN 6 DEC 98 Z.A.R. T.P.O. cancel. Cape Town DE 8 98 and Anvers 4 JAN 99 transit and arrival cancels are on the back. An uncommon T.P.O. cancel on cover that would have been posted on the train between Johannesburg (Transvaal) and Naauwpoort (Cape), as the service was operated by the Z A R even though parts of the line were in the O.F.S. and the Cape of Good Hope and outside the Transvaal.