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Viewing will be from 10am on the morning of the sale.
He took his large audience, with an illustrated account of an expedition, to Everest, in which he took part in 1976.
As a member of a British / Nepalese joint venture he described the route taken from Kathmandu through the foothills of the mountain.
Ac mae ffrwyth ei lafur iw weld ar hyd a lled Ardudwy.
Dwin cofio fy nhad yn deud sawl tro pa mor anghyfiawn oedd hi nad oedd John wedi ennill cap amatur dros Gymru.
October when the President, Michel Benson introduced the speaker Mr John Muston.
Mr Muston was making a welcome return to the Society.
The Society will then meet on the third Thursday each month until July 2014.
Those who have heard Mr Muston speak on other expeditions previously will be certain of an exciting evening.
It is not often that audiences in rural communities get the chance to see the first performance of a new work but in Barmouth on Friday just such an opportunity occurred.