25 Fr. Red Cross in the block of four being a correctly franked multiple franking on registered special delivery letter with special cancellation SAARBRÜCKEN IBASA 23. 4. 50 (2. strike on block of four from 29. 4. ) to Saarbrücken-Schönbach with arrival postmark on the UMMER over SAARBRÜCKEN 2 30. 4. 50, small margin traces, very scarce multiple franking, photo expertize Hoffmann BPP