The British Guiana 1c Magenta is the most valuable rare stamp in the world. In 1856, The British Guiana (now the independent nation of Guyana) post office issued the initial run of 1c magenta stamps for use in newspaper circulation. When an expected shipment of the stamps went missing, an emergency run was produced as a stop-gap measure. The printers of this emergency run added a small boat to the stamp, which can be seen faintly on the face of the stamp underneath the signature of postal clerk E.D Wright, distinguishing it from the official stamp run. Only one copy of this emergency print run is known to exist.