The text in question was from one of the famous Statutes of uncertain date circa 1266-1304 while according to the OED the word "troy" in connection to weight is first attested a century later in 1390.
The text in question was from the Assize of Weights and Measures, one of the famous Statutes of uncertain date circa 1266-1304. However, according to the OED the word "troy" in connection to weight is first attested about a century later in 1390.