Specimen Newspaper Wrappers from Belgium

Does anyone have more information about these?

The wrappers are 316mm long, the indicia are 21mm high.
  They appear to have been hand cut from a sheet using lines which were printed 40mm apart.
In an 1893 Belgian catalogue by J B Moens they are shown as having been produced in 1878.

I would be interested in more information about these wrappers.

Contact  jpkos@aol.com
 

Jan Kosniowski
15 April 2007