Assertion: coin's ounce | /r/HasProperty | 31 g
Facets:
Source sentences:
text: Between 1987 and 2012 a series of bullion coins, the Britannia, was issued, containing 1-troy-ounce (31 g), 1⁄ 2
text: Since 2013 Britannia bullion contains 1-troy-ounce (31 g) of fine gold at a millesimal fineness of 999 (24 carat).
text: The silver coins were available in 1-troy-ounce (31 g), 1⁄ 2