2/03/2012 South Africa
The 1933-48 pictorial definitive series ('SUID-AFRIKA' hyphenated on Afrikaans stamps) contains several constant positional varieties. The 'Falling Ladder' flaw on the 6d Orange Tree (SG 61a) is the most dramatic!
To spot this variety, you do not even require a magnifying glass! As indeed this must be one of the largest - if not the largest - positional varieties to occur on a British Commonwealth stamp!