Swaziland SG D1 1933 incoming postage due cover from South Africa

1933 (JAN 26) incoming cover from Johannesburg, underfranked by South Africa 1930-47 Official ½d black and green (SG O12), tied by machine cancel, with circular 'T/LXV' tax mark (completed for '3d' in blue crayon) applied on despatch. The deficiency paid on arrival by 1933 1d carmine postage due (issued 23 Jan 1933) in combination with SOUTH AFRICA 1927-28 2d postage due, tied by individual very fine strikes of 'MBABANE / SWAZILAND' cds, dated '27 JAN 1933', with a further strike on reverse. Philatelic, but a scarce and most interesting usage. - P267000805