情人节贺卡在18世纪流行起来，并在印刷技术普及后开始大规模生产，几百年来赠送情人节贺卡的传统一直长盛不衰。早年的情人节贺卡虽然没有鲜艳的色泽和亮亮的镀金，但是却有一种朴素自然的风味和人情味。
A vintage Valentine circa 1903. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1902. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1902. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1904. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1905. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1907. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1908. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1909. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1910. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1910. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1912. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1920. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1921. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
A vintage Valentine circa 1922. NEW YORK PUBLIC LIBRARY // PUBLIC DOMAIN
（来源：Mental Floss 编辑：丹妮）
