Colombia / Germany 1927 Airmail Cover

Colombia / Germany 1927 European sized blue airmail cover with dual franking. Sent registered from Hamburg, Germany with 70pf metered postage to Colombia. Two SCADTA stamps added, 20c and 60c with machine overprint "A". The 20c has red "R" overprint added as well. Stamps were cancelled in transit and tied by "Servicio de Transportes Aeros, Barranquilla, 28.11.1927". Blue Barranquilla arrival postmark. Carried by surface mail between Hamburg and Barranquilla and from there by SCADTA airplane to Medellin. Some creasing, tear on back flap with small tear through front. Sismondo certificate.