15 Fr. "Day of the Postage Stamp 1950" in mixed franking with 5 Fr. and 15 Fr. "Saar III" as well 15 Fr. Peter heap as correctly franked on registered cover from Saarbrücken 23. 4. 50 to Völklingen with reverse arrival postmark from 24. 4. 50, faultless condition, photo expertize Ney VP: "Michel. No. 291 with first day cancel. . . . In perfect quality. ", Michel 360.- - genuine used First-Day-Covers of this stamp are not all too frequent!