Here are an airline issue airmail labels from DDL (Det Danske Luftfartselskab), Denmark.
Year: 22.9.1920, Gummed. Günter Mair's catalogue no: - DNK-B-1, red/blue/white, perforated
H 10 ¾ ,booklets with 20 strips of 7, 5*****
Year: before 1945, Gummed. Günter Mair's catalogue no: - DNK-B-2, grey-blue/light
grey-blue/white, 5*****
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