Large bronze mirrors became popular around the Genroku era of the Edo period. These mirrors bear the "Tenka-ichi" (Best in the World) mark and the names of the makers: Fujiwara Yoshinaga, Yoshitsugu, and Yoshishige (three mirrors). From the mid-Edo period, bronze mirrors with a diameter of 20 centimeters or more, used as full-length mirrors, became common. Although they were expensive at the time, they were often used as wedding gifts and for celebrations. The designs also increased, featuring traditional motifs like pine, bamboo, plum, crane, and turtle, along with celebratory characters. It seems that mirror polishing craftsmen existed to polish the mirror surfaces and keep them clean from clouding or scratches. Without maintenance, copper will blacken and develop verdigris due to aging. The appeal of bronze mirrors lies in their historical Japanese patterns. These are antique items from several hundred years ago, so please refrain from purchasing if you are overly concerned about their condition.