Dr. Mario Diena (6 July 1891 – 4 November 1971)Background notes on The Roll of Distinguished Philatelists September 2011, Roll of Distinguished Philatelists Trust,…
Dr. Mario Diena (6 July 1891 – 4 November 1971)Background notes on The Roll of Distinguished Philatelists September 2011, Roll of Distinguished Philatelists Trust, London, 2011. Archived here. was an Italian philatelist who was added to the Roll of Distinguished Philatelists in 1956.
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