[2] Hayman was a specialist in Aerophilately, for which he won a medal at the 1923 London International Stamp Exhibition.
He also collected to medal level Belgian Congo, China, Hungary, Liberia, Mauritius, and Spain.
Hayman was the joint founder of Aero Philatelic Society and President of the Hertfordshire Philatelic Society.
He was awarded the Order of the Crown of Belgium in 1912.
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