Europa stamps used as Tax Stamp – Belgium

Beside Switzerland others countries have being using some of their EUROPA stamps as TAX stamps for underpaid postage letter. For example on this page you can see the 15f – 1993 Europa stamp used for TAX (on a letter posted without stamp from Tubize), on the second letter with under paid postage from England, the 2f – 1957 Europa stamp is being use for Taxation purpose and the loose 6f – 1960 Europa stamp bear a T letter also being use for TAX purpose.