Pattern coin

Issue 55, June 2010. Yutaka Nishiyama, Pattern Matching Probabilities and Paradoxes as a New Variation on Penney’s Coin Game （页面存档备份，存于互联网档案馆）, International

自由女神头像双鹰金币（英語：Liberty Head double eagle）又名凤冠双鹰金币（Coronet double eagle），是1849年开始试铸图案币（英语：Pattern coin），1850至1907年为商务流通打造的一种20美元面额金币，由美国铸币局首席雕刻师詹姆斯·巴顿·朗埃克设计。

eagle pattern. The Numismatist (Colorado Springs, CO: American Numismatic Association). 2007-07: 57–62.  Ganz, David L. The steps to Anthony. CoinAge (Encino

1966: Current Coin 1967: Siliconn 1968: Mountain Call 1969: Tudor Music 1970: Welsh Saint Ascot to receive two Group One sprints in Pattern reshuffle. racinguk

dollar, half dollar. Coin World. 2015-06-17 [2016-08-24]. （原始内容存档于2016-03-06）.  Charles Edward Barber. The Society of U.S. Pattern Collectors. [2016-08-25]