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The collection and study of postcards.

[From Greek deltion, diminutive of deltos, writing tablet, letter.]

del′ti·ol′o·gist n.


Someone who collects and studies postcards.
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Dennis, a photographer and deltiologist (postcard collector
A deltiologist website reveals that collectors are interested in subjects as diverse as postcards of the Berlin Wall, frogs, books and even corkscrews.
Fact is, hold-to-lights are not so well known to many, other than deltiologists (card collectors).