South Africa 1920 KGV 1½d Coils with Printing Flaws

1920 KGV 1½d Coils (SG 20var/CC 19 var). VF/UM/M TWO PAIRS, both pairs showing PRINTING FLAWS the pair on the left a large "flaw" in the King's head on the top stamp (an inking aberration due to thick gum particle on reverse affecting impression on front) and the pair on the right a smaller "flaw" at the back of the King's head on the top stamp. Additionally the left pair (UM) shows the attachment of a COIL JOIN on the bottom stamp. The right pair (M) has both stamps showing ISOLATED PERF HOLES. Interesting pair.