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Post by barhata on Feb 15, 2014 19:53:53 GMT
Here is a set of Puerto Rico semi-official issues. Local private companies had contracts with the government postal authorities to charge a small fee in addition to rates charge by the postal authorities for the delivery of mail. Of course Scott does not list this issue, but they are listed in Sanabria's Air Post catalog since 1939. Here is a close-up of one of the designs that shows the local airmail route:
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