Private postal stationery

Private postal stationery are cards or envelopes with the official Swiss Post stamp printed on them, which were additionally provided with advertising or views at private instigation.
Around the turn of the century (1900) these were used very frequently for exhibition cards and are generally much rarer than similar cards with conventional postage stamps.

Leipzig Saxon-Thuringian Industry and Commerce Exhibition Private Postal Stationery 1897 *
19,00 EUR
Leipzig Saxon-Thuringian Industry and Commerce Exhibition Private Postal Stationery 1897 * 
19,00 EUR
Leipzig Saxon-Thuringian Industry and Commerce Exhibition Private Postal Stationery 1897 *
19,00 EUR
Leipzig Saxon-Thuringian industry and trade exhibition private postal stationery 1897 special cancellation May 27, 1897
19,00 EUR
Leipzig Saxon-Thuringian Industry and Trade Exhibition Private Postal Stationery 1897
19,00 EUR
Cassel singing competition of German men's choir private postal stationery special cancellation May 26, 1899
19,00 EUR
Cassel singing competition of German men's choirs 1899 private postal stationery PP9C100 *
19,00 EUR
Stuttgart 5th Day of the Greater German Stamp Trade 1942 Private postal stationery special cancellation November 6th, 1942
9,00 EUR
Stuttgart 5th Day of the Greater German Stamp Trade 1942 Private postal stationery 
9,00 EUR
6 years of collector groups private postal stationery 6 Pfennig Hitler special stamp Crimmitschau Stamp Day 1942
9,00 EUR
6 years collector groups private postal stationery 5 Pfennig Hitler PP155C3 *
5,00 EUR
Pelikan ink private gift matter Reichspost 3 Pfennig * around 1900
19,00 EUR
76 to 90 (from a total of 224)