"Jean-Baptiste Philippe Constant Moens and the firm he established in Brussels were much esteemed in the world of philately. Obituary writers recognised him as the world's first dealer in stamps... All that is known of the discovery of the first specimens of the Post Office issue, indeed of much of the history of the handful of those stamps eventually found, came from his pen in the late 1890s."
Helen Morgan, author of Blue Mauritius - The Hunt for the World's Most Valuable Stamps
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