Marcellus Purnell Castle, known as M.P. Castle, was a British philatelist who was President of the Royal Philatelic Society London from 1913 to 1917, the first editor of The London Philatelist from 18
The Royal Philatelic Society London is the oldest philatelic society in the world. It was founded on 10 April 1869 as The Philatelic Society, London. The society runs a postal museum, the Spear Museum
Premises of the Royal at 15 Abchurch Street
The former premises of the society at 41 Devonshire Place on the corner with Devonshire Street
The front cover of the first number of The London Philatelist, Vol. 1, No. 1, January 1892.