A stamp honoring al-Khwārizmī' — A stamp issued September 6, 1983 in the Soviet Union, commemorating al-Khwārizmī's (approximate) 1200th birthday.
Photo Credit: By Unknown - http://www.muslimheritage.com/topics/default.cfm?ArticleID=631, [1], Public Domain, https://commons.wikimedia.org/w/index.php?curid=2652443