Chusa) are considered to be antiques. Usage in Southeast Asia Singaporean usage The seal has been present in all Singapore dollar banknotes since its first series, bearing the chairman of the Monetary Authority of Singapore (MAS) or the Board of Commissioners of Currency Singapore (BCCS). Vietnamese usage The seal is used to a lesser extent in Vietnam by authorised organisations and businesses, and also traditional Vietnamese artists. It was more common in Vietnam prior to French rule, when signatures became the usual practice, although usually seen as having less authority in a corporate environment. See also The Eight Masters of Xiling and Xiling Society of the Seal Art Cash seal Heirloom Seal of the Realm Knob carving Side carving Seal script Notes References Citations Sources Kong Yunbai 孔雲白, Zhuanke Rumen 篆刻入門. Shanghai Book Publishings 上海書店印行: Shanghai, 1936. Qu Leilei, Chinese Calligraphy. Cico Books Ltd.: London, 2002. Wang Jia-nan; Cai Xiaoli and Young, Dawn; The Complete Oriental Painting Course: A structured, practical guide to painting skills and techniques of China and the Far East. Quarto Publishing plc. and Aurum Press: London, 1997. Wren, Christopher S. Chinese Chops: A Signature in Stone. New York Times. 10 February 1985. Masterpieces of Japanese Prints: Ukiyo-e from the Victoria and Albert Museum by Rupert Faulkner, Basil William Robinson, Richard Lane, Victoria and Albert Museum External links Chinese Seals at China Online Museum The Art of Chinese Chop (Seal Carving) History of Chinese Seal Carvings Art-Virtue.com History of Chinese seal making A chop is necessary for approving decisions relating to the operations and management of a company in China. Introduction to Chinese Seal Carving Seal culture still remains in electronic commerce HANKO (Daniel Semo, 20 July 2021) - 99% Invisible, Episode #451 Seals (insignia) Authentication methods Chinese heraldry Chinese inventions Chinese seal art East Asian art East Asian traditions Identity documents Japanese heraldry Korean heraldry Vietnamese heraldry