Originally produced as a poster in 1897, the Waverley Cycles postcard is regarded as the most famous postcard in existence. It is widely believed that only a handful, and perhaps less than half a dozen are known to exist. Several of these known examples have considerable writing on the message portion of these cards as well as having been postally used.Ref. "The Encyclopedia of Antique Postcards" by Susan Brown Nicholson, 1994 Wallace Homestead Publishing.