Germany, Democratic Republic: Airmail labels

Here is the lot of airmail labels from East Germany or Germany Democratic Republic.

Year: 6.1950, Gummed. Günter Mair's catalogue no: - GDR-A-2a, perforated 11 ¼ , sheets of 15(3x5), ref.: "MDV Druckerei Neuruppin 6 50 28000 833 3369"; futher dates are: 8.50, 10.50, blue or dark blue/white, 2**

Year: 2.1970, Ungummed. Günter Mair's catalogue no: - GDR-A-6, perforated V 9 ½  or V 12 ½ , rolls of 500, transparent paper ( i also have on normal paper), printing blurred, blue or violet-blue/white, 1*

 

Year: approx.1980, Gummed. Günter Mair's catalogue no: - GDR-A-7, perforated V 10 ¾  or V 11 ½ rolls of 500, transparent paper, printing blurred, "M" modified, blue or violet-blue or greenish blue/white, 1*

Year: 2.1990, Gummed. Günter Mair's catalogue no: - GDR-A-8a, perforated V 10 ¾ , rolls of 500,
blue/white, 1*