Career
He was a wealthy banker in India, owned large estates in Malaysia and held a number of important public offices in British India. Masson was a former Treasurer, Vice President and President of the Philatelic Society of India and a frequent contributor to the Philatelic Journal of India. He formed world class collections of Afghanistan and Kashmir, as well as important collections of Ceylon, Portuguese India, Sirmoor, Poonch and British India.
His work showed that the so-called first issue of Kashmir was bogus, a feat which The London Philatelist called "..one of the most memorable and startling of accepted disclosures ever made in philately".
Masson lived much of his life in India. He was Managing Director of the Punjab Banking Company of Lahore, Karachi and Kashmir.
He served as Aide-de-Camp to the Commander-in-Chief and Viceroy of India, and for fifteen years was Lieutenant-Colonel in the 1st Punjab Volunteer Rifles. Masson contracted a serious illness while inspecting his estates in Penang and was obliged to return to London, where he died on 30 December 1915.
He was buried at Brookwood on 1 January 1916.