Postcard US-3154507 to Portugal was a maxi card showing a special USPS truck that traveled the U.S. between 1939 and 1941 to offer a mobile philatelic exhibit to the public promoting stamp collecting, operated by a three-man crew. The 22 cent stamp was one of the four Stamp Collecting commemorative designs showing a boy examining a stamp collection, issued in State College, Pennsylvania on January 23, 1986, as part of the first USPS commemorative stamp booklet.
Today, USPS is more gearing up to compete with Fedex and USPS in package delivery business. It has a booth at the 2015 CES to promote the packaging and shipping services. Visitors to the booth can get their pictures taken and printed as pre-paid postcards.