i was looking into my stamp album under south africa section and realized that the south africa has plenty of variety and error stamps.currently I found 3 of them and their not common variety at all.the first one is colour variety which is printed in bride yellow-greenish blue instead of yellow-greenish blue normally on the stamp.secondly is the variety in size which is shorter by 1mm and less one perforation hole on both vertical sides.last stamp I can see 3 shadows on the elephant stamp compare to a normal one on the right.south africa stamps are really shocking me.i think there are plenty of variety/error stamps in south africa stamps.if you do have any of south africa stamp,please try to look for it now,you might find a major error for the south africa stamps,goodluck.
Just about every stamp ever produced has color varieties....a light, medium and dark shade. Most are fairly common, some are not. If the color difference is minor most catalogs won't even mention it. The results are clearly shown with your shades of greenish-blue on the first group.
Since the development of presses that can print in several colors we can also find color shifts because sometimes things just don't line up the way they should.....like your elephant stamps. The white spot under the foot on the left stamp is a typical tell tale sign of a shifted color. Most of these shifted colors are minor variances are generally considered to be minor freaks. Very few are mentioned in catalogs.
Freaks happen once in awhile just about anywhere, errors happen every time in the same place. Inks are mixed in 55 gallon drums, sometimes if they sit too long the colors can start to separate.
Your center stamp is a different type of freak. I think this is a stamp that has been treated with something (chemicals)......it looks (to me) that it is not smaller because of a perfing issue. It looks smaller because it is shrunken. The profiles look smaller on the right stamp. If you check the perforations it should show the difference.
I am not trying to discourage you, I'm just trying to explain guidelines that were established long before I started collecting.
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