USPS Sea Surface Block of 4 Global Forever Stamps In 2014, the U.S. Postal Service introduced Global: Sea Surface Temperatures, a new Forever international rate stamp. This round stamp features a visual representation of our planets sea surface temperatures. It shows the Earth with North America at the center and parts of South America, Asia, and Europe just visible on the edges, surrounded by vivid bands of color throughout the oceans. The image is one frame in a 1,460-frame animation created from the output of a computer model of Earths climate by the National Oceanic and Atmospheric Administrations Geophysical Fluid Dynamics Laboratory. This image also combines the depiction of sea-surface temperatures with visible vegetation on the land masses, an element derived from a satellite composite created by NASA. Art director William J. Gicker designed this stamp.