I still have shoeboxes full of South African stamps on paper cutouts, and I dunk them batch by batch into water to separate the stamp from the paper.
Those that have nice postmarks on (place name and date), I keep on the paper, though.
Below is such a page.
Some of these postmarks belong completely to history.
The cities and towns that they denote have been renamed in recent years.
Issued Jul. 15, 1982
Perf. 14½x14, 14×14½ | Litho. and Recess Printing | No watermark
564 A229 1c Brown (’84) | Old Provost, Grahamstown
566 A229 2c Green | Tuynhuys, Cape Town
574 A229 8c Intense Blue (’83) | Leeuwenhof, Cape Town
576 A229 10c Light red-brown | City Hall, Pietermaritzburg
578 A229 11c Cerise (’84) | City Hall, Kimberley
579 A229 12c Deep Ultramarine (’85) | City Hall, Port Elizabeth
580 A229 14c Rose brown (’86) | Johannesburg City Hall
(Note- Only the stamps in the picture are listed here; several others were issued as part of the fourth definitive series).
[Source: 2021 Scott Standard Postage Stamp Catalogue, Vol. 6A]
Postmarks:
ADELAIDE, HEIDELBERG, BEAUFORT WEST, WESTONARIA, BRANDFORT (Winnie Mandela since 2021), BENONI, ESTCOURT, BOKSBURG, FOCHVILLE, GRAHAMSTOWN (now also known as Makhanda), ALBERTON, KROONSTAD, KING WILLIAM’S TOWN (Qonce since 2021), NIGEL, PIETERMATIZBURG, PORT SHEPSTONE, POTCHEFSTROOM, QUEENSTOWN (Komani since 2016), SASOLBURG, STRAND, SPRINGS (now part of the City of Ekurhuleni), SOMERSET WEST, THBAZIMBI, VANDERBIJLPARK, LICHTENBURG, WORCESTER.