South Africa. (Great Britain). 1964. Envelope addressed to East London South Africa bearing Great Britain SG 520, 3 violet tied by London date stamp, underpaid with framed 'T/21c' and bearing South Africa postage due 5c indigo tied by east London receiver with boxed instructional 'Inconnu/ Unknown' and hand-stamp '6d/ To Pay/Ldn. R.L.B.' on face.