30+10 Fr IMOSA, faultless Secretary of State souvenir sheet under photo corners in the folding carton with posthorn on the title page and text on page 2: \"on the occasion of of the first international motif stamps exhibition Saarbrücken 1952 presented of the Postal service and telegraphs administration of the Saar country, Saarbrücken, the 29. March 1952. \" rare!