If you collect the Falkland Islands Map issues, you might be interested to know that it is the most flawed design in all the British Colonies.
There are seven constant flaws that repeat six times on the sheet of stamps in various locations. In addition are the many individual flaws that have been recorded for this set.
Ironically what is truly rare for this issue is a stamp with no flaw.
The image below shows where to look on the map for the various flaws.

Here are the details of the flaws, quoted from Larry Goldberg's book "The 1946 Thick Map Issue".
Flaw - S01- 70 degree parallel does not reach bottom frame line on stamps in positions 2, 7, 22, 27, 42, & 47 (rows 1, 3 & 5 / columns 2 & 7)
Flaw - S02 - Small dot appears between the frame of the map and then inside of the frame plate at the 50 degree line of longitude in the upper left hand corner of the map at positions 3, 8, 23, 28, 43 & 48 (rows 1, 3 & 5 / columns 3 & 8)
Flaw - S03 - Broken arc caused by a portion of the 80 degree line of latitude being rubbed away at positions 4, 9, 24, 29, 44 & 49 (rows 1, 3 & 5 / columns 4 & 9)
Flaw - S04 - Very small dash appears on the 30 degree West meridian at approximately 73 degrees South at positions 5, 10, 25, 30, 45 & 50 (rows 1, 3 & 5 / columns 5 & 10)
Flaw - S05 - Black dot over the a of East below the frame line at positions 12, 17, 32, 37, 52 & 57 (rows 2, 4 & 6 / columns 2 & 7)
Flaw - S06 - Small dash on the 20 degree meridian directly West of "S. Orkney Is." at positions 14, 19, 34, 39, 54 & 59 (rows 2, 4 & 6 / columns 4 & 9)
Flaw - S07 - Very small gap on 60 degree meridian just before it reaches the 80 degree parallel at positions 15, 20, 35, 40, 55 & 60 (rows 2, 4 & 6 / columns 5 & 10)