Here are a couple of Spanish Revolutionary War air mail stamps that were used in the Canary Islands around 1937.
If I remember correctly (someone correct me if I'm wrong), the air mail was handled by Lufthansa (German air carrier).
Anyway, I don't think that these are seen all that often, although they are not all that valuable, but they are interesting.
Scott #9LC32
Scott #9LC33
 
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