In February 1897, 800 copies of MiNr. 1-6 were printed specifically for the Universal Postal Union office in Bern, Switzerland.  760 sets were distributed to member countries, 5 to each member nation.  The remainder were used by the Reich Post Office for exchange with a Mr. Antoine in Berlin.

These issues differ slightly from the postally-issued MiNr. 1-6 in that they feature a heavier overprint.