The FedEx envelope that contained my shipment of stamps from South Africa was marked ‘Extremely Urgent’.
Well, it wasn’t really (extremely urgent), I thought, and it’s amazing that modern logistics can make land to my porch in a matter of days, that what I had bought online from a location 10,000 miles away.
These are called control blocks: blocks of four or six stamps in the corner of the sheet, with the sheet margins intact. If you are lucky, the margins contain the date the sheet was printed, and other details.
The downside is that these take up an enormous amount of space in an album that is made of them. For now, I am collecting only the blocks of the so-called definitive issues of stamps. Unlike commemorative stamps, which are issued for brief periods in limited quantities, definitives are usually issued in larger quantities and used over many years.
From 1961 to 2020, the South African Post Office issued eight definitive series of postal stamps.

South Africa’s Fifth Definitive Series (Succulents), issued 1988-93;
South Africa’s First Definitive Series (the ‘Pouring Gold’ 2c stamp), issued 1961-74;
South Africa’s Seventh Definitive Series (Colorful South Africa), issued 2000-’07.

South Africa’s Sixth Definitive Series (Threatened Fauna), issued 1993-96;
South Africa’s Seventh Definitive Series (Colorful South Africa), issued 2000-’07.

South Africa’s Second Definitive Series (Flowers, Birds & Fish), issued 1974-77;
South Africa’s First Definitive Series (the ‘Groot Constantia Wine Estate’ 2½c stamp), issued 1961-74.

South Africa’s Eighth Definitive Series (South African Beadwork), issued 2010-18;
South Africa’s Seventh Definitive Series (Colorful South Africa), issued 2000-’07;
South Africa’s Sixth Definitive Series (Threatened Fauna), issued 1993-96.