Use 'philately' when discussing hobbies, often considered a patient and meticulous pastime. She took up philately to appreciate the art on stamps.
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Historical Value
'Philately' can imply a deeper interest in history and geography, through the origins of stamps. His interest in philately began with his grandfather's old war letters.
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Specialization
Philatelists may specialize in certain eras or types of stamps, focusing their collection and research. She specializes in philately of Victorian-era postage.