An interrupted projection is one where the terrestrial "surface" is cut  in order to avoid the distortions that inevitably arise from projecting the earth's three-dimensional surface onto a two-dimensional plane.
     The map below shows an "interrupted projection" with its center in the Pacific Ocean. I haven't been able to discover or determine which particular projection is used.

     On this map on an equal area sinusoidal projection the center is in Africa.

     The Scott catalog for this stamp from Brazil identifies the map as a Mercator Map. If so, it is the only interrupted version of a Mercator projection that I know of.