Holograph copy of the master's oath, with draft certificate in Latin that Newton took it in 1700
You shall well & truely execute the Office of Master and Worker of his Majesties Mint and perform and keep all the Covenants and agreements conteined in this writing Indented made between his said Majesty of the one part and your self of the other part which on your part are to be performed & kept, And you shall bear your self towards his said Majesty and his people in the said Office well & covenably according to the tenor and true meaning of the said Agreements, And you shall make gree to his said Majesty. All this you shall do according to the best of your skill and knowledge. So help you God.
Infra nominatus Isaacus Newton sacramentum suunt corporale in verbis suprascriplis prestitit
die Anno Regni Dom Regis
Gulielim Dei Gratia Anglia & Regis duodecimo
Coram me
Source
MINT 19/1/68, National Archives, Kew, Richmond, Surrey, UKAfter 26 December 1699, c. 140 words.