Netherlands: K.L.M airmail labels 3

Another lot of airmail labels from K.L.M. Here are full original strips of 4.

Year: before 1960, Gummed. Günter Mair's catalogue no: - NEL-B-20, rouletted H, vertical strips of 4,
parallelogram shape, blue/red(mine is orange-red)/white, 3***

  












Year: before 1960, Gummed. Günter Mair's catalogue no: - NEL-B-21, rouletted H, vertical strips of 4,parallelogram shape, light blue/orange/white, 4****

Year: 1961, Gummed. Günter Mair's catalogue no: - NEL-B-23, perforated 10 ¾ , booklets with 10
vertical strips of 4, blue/red/white, 3***