MARC ALLUM Miscellaneous Marc Allum is a generalist with a particular interest in Grand Tour souvenirs, antiquities, and 18th-century glass. He is a director of Rosebery's Auctioneers, based in South London, where his responsibilities cover works of art and collectors' items, including toys and scientific instruments. He started collecting as a small boy and later, as a student, he supplemented his income by buying and selling at auctions. This led to two years as a dealer before joining Rosebery's.