What do these markings mean? Are they for a first flight (although that should've gotten a receiving cancel?). And why are they on clearly commercial covers- wouldn't they only usually mark the philatelic covers?
I apologize for the quality and size of the pictures..
As for the first image, "Leipziger Herbstmesse" is translated to Autumn Fair (or Trade Fair) which was apparently an annual event during the 1960s (and before).
Here's a 1968 stamp for the event, which uses the same "MM" logo as shown on your cover:
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Posted 12/22/2012 07:40 am
