NEDERLAND - COVER FROM MARCEL DE VREEDEN

GREETINGS FROM AMERSFOORT
THE DITCH OF AMERSFOORT

PLEASE .. Can anyone explain me what is the meaning of this STAMPING CHECKED (FRANKERING GECONTROLEERD)

Thank you Marcel

EGYPT - COVER FROM MOHAMED AZIZ

Thank you Mohamed

UKRAINE - COVER FROM SERGE JARMAK

Thank you Serge

ITALY - COVER FROM ALDO Ι. FΟCAREΤA

Thank you Aldo

MAURITIUS - COVER FROM MARIE-ANN LAM SEEN WONG

I thank you Marie-Ann very much

POLAND - COVER FROM JAN KASZUWARA

Thank you very much Jan

P.R. CHINA - COVER FROM SUN MO XI

Thank you Sun Mo Xi for the cover
and the beautiful postcard