The fourth set of Renminbi was issued by the People's Bank of China on April 27, 1987, to meet the needs of economic development in the early stages of reform and opening up. This set (comprising nine denominations from 1 jiao to 100 yuan) features the theme of "National Unity," with the obverse depicting lifelike portraits of people from various ethnic groups and the reverse showcasing famous mountains and rivers. Advanced anti-counterfeiting technologies were also incorporated. Most denominations ceased circulation on May 1, 2018, and are highly collectible. · with the words "People's Bank of China" The design also includes a clear national emblem and a background pattern on that of banknotes. "See images for correct impression"