Argentina trip 1934, stage to Recife, registered letter from Asmara 4.6. with 2 and 10 L key value in mixed franking, transit Genoa 18.6. and Friedrichshafen 23.6, flight stamp on face, arrival Recife 27.6, exotic and scarce incoming line in superb condition, photo expertize leather BPP ". defects unintelligible", ex collection Kirch