The so-called Atomium stamps were the first stamps issued with regards to the Expo 58 happening.

The design of the stamps depicted the Atomium itself as well as the official Expo 58 logo (star).

The stamp design has been issued on 17 April 1957 for the values 2F (red) and 4F (blue), and another set of 2 stamps were issued on 4 Feb 1958: 2,5F Green and 5F Brown.

The stamps were issued as propaganda of the World Fair. The stamps have been engraved by Mr. L. Janssens and been prepared for printing by Mr. E. Meert. This both activities were done at Malines, where today the printing offices of the Belgian Post are still located.

The stamps were printed in sheets of 30 stamps (5 stamps per row x 6 rows), and were available as from the date of 17 April 1957 in all postal offices.

The stamps were perforated 11 1/2. There were 4 different plates. 

For the 4F stamps, the following printing dates have been recorded. No information about printing dates for the 2F value have been noted.

06 IV 1957 - 08 IV 1957 - 09 IV 1957 - 10 IV 1957 - 11 IV 1957 - 12 IV 1957 - 15 IV 1957 - 16 IV 1957

The first 4F sheets do not have any printing date information which is rare. 

Number printed:

• 2F stamp: 15.675.706x
• 4F stamp: 5.135.466x

The same design of the stamps of 17 April 1957 have been printed with other values 2.5F and 5F on 2 April 1958. This is mainly because of the rate change issued on 1st October 1957. The new values were 2,5F and 5F instead of 2F and 4F.

The following printing dates are known: 

for 2,5F value: 27 0I 1958 - 28 0I 1958 - 29 0I 1958 - 30 0I 1958 - 31 0I 1958 - 25 II 1958 - 13 III 1958 - 14 III 1958 - 9 IV 1958

for 5F value: 21 0I 1958 - 22 0I 1958 - 23 0I 1958

Number printed:

• 2,5F stamp: 16.381.697x
• 5F stamp: 4.548.717x