Sudan 1951 110,O56 6p black & blue, Gum tapping, Postage & Official used 

1951 110 6p black & blue, Gum tapping used P202L33S61d 1.38​

1951 O56 6p black & blue, Gum tapping, Official used P202L33S73b 1.50

used - faults - refer to images

P202L33S61d,73b was $2.88