Expo '58, Brussels World Fair star brooch

Here I have two small Expo '58 star brooches.
Belgium organised 11!!! world fairs. Expo '58 was the last one of them.
The site where the fair was organised is now know for the Atomium monument, which has recently been restored to its former glory.
42 million people visited Expo 58, including some members of my family. (Belgium consists of 30 500km² and there are about 10 million people, which makes it really small).
This star was the symbol of the Expo, it was designed by Lucien De Roeck.
For a while I collected some expo '58 souvenirs, but I sold them all except for these two small brooches.
I love the star design and I actually wear the gold coloured one a lot.