Unpaginated, with 20 leaves of blank paper. 12.2x7.5 cm. (4¼x3"), original black wrappers lettered in gold.

Pristine example of an unused pocket letter book from the California Gold Rush, published in San Francisco for Joseph W. Gregory, proprietor of "Gregory's United States & California Express," but printed by Nesbitt & Co. in New York. On the inside of the front wrapper is a description of Gregory's California Express, with twice monthly service between New York and San Francisco via the Isthmus; on the back wrapper are short descriptions of Gregory's San Francisco and Sacramento offices. OCLC/WorldCat lists only four copies, at Yale, Princeton, the New York Historical Society, and the Huntington Library.