First Ascent of Mount Everest

Rare Nepalese First Day Cover marking the 25th anniversary of the First Ascent of Mount Everest, signed by Edmund Hillary and Tenzing Norgay, postmarked, 29 May 1978, including limited edition silver coin; with a New Zealand cover marking the Conquest of Everest, signed by George Lowe, Mike Westmacott and George Band (2)