500 Fr. postal stamp with date of printing "11. 5. 53" with "50 years Rotary" and French 10 Fr. "timbre taxe" on properly franked special delivery insured letter "SAARBRÜCKEN 28. 6. 57. -- 9" to Strasbourg, certificate Ney VP (2016) "the stamps on the correctly franked, transported cover are in perfect quality. " Michel - ., a large Saar rarity !