Valentines, A Collector's Guide, 1700s - 1950s, Identification & ValuesValentines, A Collector's Guide, 1700s 1950s, is a thorough reference for accurately dating and identifying valentines. The book's dating system uses nearly 1,300 photographed cards arranged in chronological order based on extensive research. Besides the visual arrangement, collectors will find researched lists of design trends, card subjects illustrated, and important publishers for each decade and for each different type of card. These key facts