Suid Africa Colour Missing?

Hi all
I found these stamps and the missing colours stood out as unusual.
Would appreciate any help and advice as to whether known errors.
Thankyou

I don't do much with South Africa, but the first 2 appear to be Scott 98 and one of Scott 23/33/45.
Second pair are also 2 different catalog numbers.
Many stamps in "workhorse" series get reworked and reissued in variants over a span of years. They are not errors. If you are using a Scott catalog, they do a good job under the first instance of a design to note later catalog numbers of similar-appearing variants.

John
Thankyou - very much appreciated
I'll look it up

Looks like the 1st stamp is a redrawn sg104/105?

The springbok stamp on the left is a 1943 coil, the stamp on the right is one of the many variants of the sheet stamp issued between 1926-1953.
The Groot Constantia stamp on the left was issued on 31.05.1961, and occurs with two watermark varieties (same watermark but different orientations; left and right). It is the first printing of the value in the 2nd definitive series of the Republic of South Africa and was reprinted several times over the years until 1970 of which the stamp on the right is an example of.

Thankyou
Appreciate your help

I'm happy to find that post, we have enough problems with duplicates, no need to produce some in the topics!

I'll go deeper in the discussion, here is the picture :





There is the shade of the center, and the color of some stamps too. My question is for someone who would know how to classify them.

Question is : how to classify them? I mean where to start, so many from that time have similar issues and could there be some variants too? What's a good start point to study them? I looked to Scott's catalog but it doesn't give relevant results for me...

Thank you and have a nice day!

Marc

edited : Found that

https://mypsb.org/wp-content/upload...er-Merwe.pdf

open for any suggestions!

For South Africa, use Michel, SG, or the domestically produced South African Stamp Colour Catalogue. https://stampssa.africa/ may also have something of use.

These sites should be useful to you:

http://www.southafricacollector.com...initives.htm

https://www.southafricacollector.co...h_Africa.htm

Thanks you for the links, it is helpful since there are pictures to show the difference. This serie will be good to practice. Here is what I understood :

1) collect information on the web. Documents can be complementary, and when info is on many of them, it gets more trustable.
2) separate by major group.
a) Here, for the springbok, there is no doubt that the 3rd is London Printing : only possibility for feb 1926 cancel. Also, easy to see that it's the
only one with typographic printing. Rest to check if the watermark is upright or inverted.
b) For the others, I think there is some general rules about chronology of issues. Seems it get bluer and smaller with time (in general).
3) Get more samples. It is not enough of that kind to distinguish all variations.

Originally 18.5mmX22.5mm, size reduced 2 times. The smaller one (from November 1947,18mmX22mm) started when bars begun to be crosshatched. The 5th seems to be of that kind, because of crosshatching, so it means it would be the small one, for comparison. But I am not sure if it is nov. 1947 or later because of the gloss on whole stamp, I'm not sure if it's what 'screened printing' means.

Seems that Praetoria printing of 1927 and reprinting of 1948 could be differentiated by cancel date, or I need find more to put them together and find the difference... the ones from 1948 may be more blueish, to be confirmed!

Thanks again and have a nice collecting day,

Marc