Star Wars 2007 - USPS Stamp Set Printed on Postcards - First Day Issue

 Luke Skywalker
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 Princess Leia and R2-D2
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 Emperor Palpatine
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Darth Vader

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These are from the USPS (United States Postal Service) Star Wars Stamped Postal Cards 15 Designs 

They have the matching stamp on the back and are postmarked, 'First Day of Issue', May 25th, 2007, Los Angeles Ca  90052