European history lessons may fail to recount the exploratory ventures and discoveries of the Chinese Admiral Cheng Ho. This is probably because the school syllabus is very crowded and concentrates on western influences rather than travelling eastwards ~ especially for seafaring ventures.
Admiral Cheng made numerous long exploratory expeditions from China and brought back spices and other new found discoveries from India and other countries. Such adventures were undertaken centuries before lands to the east were discovered by European voyagers. Both Western and Eastern explorers were limited by the problem of navigating around the Cape of Good Hope whilst so far from home. Cheng's voyages were were far more elaborately planned and supported than those of Columbus ~ who was supported by two small ships.
Admiral Cheng is reported to have had a huge fleet of large junks. Modern engineers doubt that the indicated size of these vessels could not have been possible using the wooden construction methods available at the time. Maybe the nine-masted junk depicted in the stamp is an exaggeration. I know nothing of this argument beyond thinking ~ 'Do not underestimate the skills of the Chinese'.