Colombia: AVIANCA airmail labels

An airline issue label from AVIANCA (Aerovias Nacionales de Colombia).

Year: approx.1950, Gummed. Günter Mair's catalogue no: - CML-B-18a, perforated H 11 ¾ , vertical strips

grey-blue/orange-red/white, 5*****

Year: 1959, Gummed. Günter Mair's catalogue no: - CML-B-19, rouletted VL (narrow steps), 
H (wide steps), booklets with 5 sheets of 5(1x5), blue/red/white, 3***