1 Keller drew his pair of tongs from his breast pocket and carefully lifted a stamp from its glassine envelope. It was one of Norway’s endless Posthorn series, worth less than a dollar, but curiously elusive, and missing from his collection. He examined it closely, held it to the light to make sure the paper hadn’t thinned where a hinge had once secured it to an album page, and returned it to the envelope, setting it aside for purchase. The dealer, a tall and gaunt gentleman whose face was frozen on one side by what he had explained was Bell’s palsy, gave a one-side-of-the-face chuckle. “One thing I like to see,” he said, “is a man who carries his own tongs with him. Minute I see that, I know I’ve got a serious collector in my shop.” Keller, who sometimes had his tongs with him and sometimes didn’t, felt it was more a question of memory than seriousness. When he traveled, he always brought along his copy of the Scott catalog, a large 1,100-page volume that listed and illustrated the stamps of the world from the very first issue (Great Britain’s Penny Black, 1840) through the initial century of philately and, in the case of the British Empire, including the last of the George VI issues in 1952. These were the stamps Keller collected, and he used the catalog not only for its information but as a checklist, deliberately