The PRAGA 2018 specialized world stamp exhibition has been expanded for the new exhibition class of the Revenue Stamps to meet the high demand of the potential exhibitors. The PRAGA 2018 Individual Regulations (IREX) has been up-dated in art. 5.2. “Exhibition Classes” for a new chapter “Class 7. Revenue Stamps” with an immediate effect.The full IREX wording has been shown at: http://praga-2018.localhost/en/irex-individual-regulations/