The Indian Head (Buffalo) nickel was introduced in February 1913, replacing the Liberty Head design. These were the first official strikings of nickels in 1913, since the United States Mint's official records list no Liberty Head nickels produced in that year. However, in 1920, the numismatic community learned of five Liberty Head nickels dated 1913, all owned by Samuel Brown, a numismatist who attended the American Numismatic Association's annual convention in 1920 and displayed the coins there. He had previously placed an advertisement in the December 1919 issue of The Numismatist soliciting information on these coins, offering to pay US $500 for each and ostensibly purchasing them as a result. However, Brown had been a Mint employee in 1913, and many numismatic historians have concluded that he may have struck them himself (or had them struck) and taken them from the Mint. If true, this was not a unique occurrence; such clandestine strikes were quite common in the 19th century, with the Class II and III 1804 silver dollars perhaps the best-known instance. Other numismatic authorities, such as Q. David Bowers, have questioned this scenario, and pointed out that there are several methods by which the coins could have been legitimately produced; e.g., they may have been lawfully issued by the Mint's Medal Department "for cabinet purposes," or could have been struck as trial pieces in late 1912 to test the following year's new coinage dies. Bowers, however, did not entirely discount the private minting theory.