Ramiamin,
How wonderful! I looked at your coin, it seems to be similar in variety to all the different banner lengths of the KM#54a 5 milliemes... but the date is of the KM#54 type. I am so excited that you have discovered a variety! Have you tried to contact Dato? He is the ref for Sudan, if you go to the Sudanese listings, you will find his name at the bottom of the listings. I am sure he will be pleased as well.
Thanks for sharing with us!
Library Media Specialist, columnist, collector, and gardener...
Thanks a lot.
I've just added a new year line for this variety, and used your picture (with your name) in the comments section to show the 2 varieties. Thanks a lot again :)