Ethiopia: Ethiopian airlines airmail labels

Here is a nice airmail label from Ethiopian Airlines.

Year: approx.1955, Gummed. Günter Mair's catalogue no: - ETH-B-1, imperforated, oval shape,
red/green or light green/yellow or orange-yellow/white, 4****

Year: approx.1965, Gummed. Günter Mair's catalogue no: - ETH-B-2, perforated 11 ½ , sheets, some 
labels come partly rouletted, red/green/yellow/white, 4****