There was mail today, with of old South African stamps from an Ebay seller in North Carolina.
(I have expanded the original 1961-2000 timeframe for my South Africa stamp collection backwards to 1910, when the Union of South Africa was established).

Issued Nov 2, 1936, for the Johannesburg International Philatelic Exhibition
Perf. 14½ x14, watermarked Multiple Springbok’s head, inverted, overprinted ‘JIPEX 1936’
MS70 7 Dromedaris (Jan van Riebeeck’s ship) 1d grey and carmine
Issued in miniature sheets of 6 stamps with marginal advertisements.
21 different arrangements of the advertisements exist.