On the occasion of the accession to the throne of His Royal Majesty, Prince Philippe, and of 20 years of reign of His Royal Majesty, King Albert II, on 21 July, the Council of the IBPT has decided to allow all radio amateurs holders of a Belgian license to use the prefix "OO" instead of the standard prefix "ON", and this for two months (from 21 July to 20 September 2013).

QSL via bureau

Greetings from ON4JM    ( province Luxembourg   LU  Work all Belgian Provinces Award ) see UBA website