Cannot locate this stamp online or in any of my stamp books...because they don't seem to cover this date and area.
Nice group of good used, cancelled 1948 stamps from Portugal "Correio Aereo Aeroporto- 28-12-48"
Pair of Attached $15 Purple Ship stamps, and single 3$50 Blue Ship stamp on piece Pan Am Air Mail envelope, excellent used condition.
Take a look at the pics...maybe you have a book on Portugese Stamps?
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