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 being a 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!