South Africa Stamp With Narrow In Height Error, New Discovery

Hello,I need help from all of you again becouse im a stamp newbie and dummy.Here is a South africa 1949 voortrekkers monument 3d stamp with short or narrow in height and less a perforation hole on each vertical side ERRORS?Obviously,this stamp is certainly very short or narrow in height compare with a normal stamp of this issue,I have seen and compared more than 1000 of this stamps and their in normal height and perforation hole on each vertical side of the stamp.I do not find this variety or error either in SG or SCOTT catalogue(my catalogues are considered old version)Maybe it is listed in the new version That I do not know.I have a few question below:

1.Is this a genuine variety?
2.If its a variety,is this rare or common?
3.Have you ever seen anything like this before on south africa stamp?
4.Any special value if its a genuine variety?
5.A new discovery?

Hopefully you can answer all of my questions above and give me some help,your help is much apprieiciated this time.Thank you

NOTE THAT THE FIRST SCAN IS SHOWING MY STAMP ONLY AND THE REST OF THE SCAN ARE NOT MY STAMPS,THIS STAMPS ARE NORMAL(FOR COMPARING WITH MY STAMP PURPOSE ONLY)

Miko....

It's just another common type of perf freak.

As I've said before.....you need to stop counting perfs and buy a perf gauge.