Here is a complete sheet of 36 airmail labels from K.L.M. Comes on pads of 25 sheets.
Year: approx.1937, Gummed. Günter Mair's catalogue no: - NEL-B-10, perforated 13 ¼ , sheets of
36(3x12), frame size: 43x12mm, "B" and "R" modiffied, blue or grey-blue or dark blue/white, issued for customers in Palestine, 4****