Germany: Allied Occupation - British Zone airmail labels

Here are the airmail labels from Germany Occupation - British Zone.

Year: 8.1948, Gummed. Günter Mair's catalogue no: - AOG-A-5a, perforated 10 ¾ , sheets of 40(4x10), thin paper, economy gum, ref.: "Westermann, Bswg 1200 Blocks zu 1000 Stück 8.48/952 RPZ Nr.90/La", grey-blue/white, 3***

Year: 1.1949, Gummed. Günter Mair's catalogue no: - AOG-A-5b, perforated 10 ¾ , sheets of 
40(4x10), thick paper, normal gum, ref.: "Westermann, Bswg 20000 Blocks zu 1000 Stück 1.49/1948 RPZ Nr.90/La", bright blue or blue or dark blue/white, 2**

Year: 3.1949, Gummed. Günter Mair's catalogue no: - AOG-A-6, perforated 11 ¾ , sheets of  
40(4x10), ref.: "Ludw. Flöttmann, Gütersloh. 20 000 Blocks zu 1000 stück. 3.49/422", grey-blue or dark blue/white, 2**

dark blue

grey-blue