Cover franked with single 1900 2½d ultramarine 'ORANGE RIVER COLONY' overprint issue (SG 135) tied by KROONSTAD cds dated APR 7 1902 and censored with oval 'PASSED CENSOR KROONSTAD' marking in black and straight line 'P.B.C.' in magenta both also tying stamp. Addressed to WINDHOEK, GERMAN SOUTH WEST AFRICA with arrival cds on reverse.