There are two official types of cover with the same design. One of the 2 design is higher and has the text below the Atomium Design: EXPOZITIA UNIVERSALA - Bruxelles - 1958. The set of with brown part has a brown design and the other one has the light grey part for the same light gray color.
As mentioned in the introduction part, there are quite some overprinted stamps combined with the 3 different set of how the stamps have been cut to put on the covers, indicates that they are 3 different ones with normal overprint and three with reverse overprint for one set and each cover type. In total, there are 24 types of different combinations of cancellations, stamp set and covers. Most are depicted below but still some missing.
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normal overprint + commemorative text in brown at the left + cover without text under design
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normal overprint + commemorative text in brown in the middle + cover with text under design
same + cover without text under design
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normal overprint + commemorative text in brown at the right + cover with text under design
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reverse overprint + commemorative text in brown at the left + cover with text under design
same + cover without text under design
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reverse overprint + commemorative text in brown in the middle + cover with text under design
same + cover without text under design
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reverse overprint + commemorative text in brown at the right + cover with text under design
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normal overprint + commemorative text in light grey at the left + cover with text under design
same + cover without text under design
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normal overprint + commemorative text in light grey in the middle + cover with text under design
same + cover without text under design
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normal overprint + commemorative text in light grey at the right + cover without text under design
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reverse overprint + commemorative text in light grey at the left + cover with text under design
same + cover without text under design
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reverse overprint + commemorative text in light grey in the middle + cover with text under design
same + cover without text under design
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reverse overprint + commemorative text in light grey at the right + cover without text under design
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