This is a rare vintage enamel charm that measures 1/2" in diameter and tested as 835 silver content.
The Atomium is a building in Brussels originally constructed for Expo 58, the 1958 Brussels World's Fair. Designed by the engineer André Waterkeyn and architects André and Jean Polak, it stands 102 m (335 ft) tall. It's nine 18 m (59 ft) diameter stainless steel clad spheres are connected so that the whole forms the shape of a unit cell of an iron crystal magnified 165 billion times.
Thank you for looking!
Vintage Rare Enamel 835 Silver Atomium Charm 1958 World Expo Brussels