The Da Vinci Notebooks at sacred-texts.com
Saturday the 2nd day of March I had from Santa Maria Novella 5 gold ducats, leaving 450. Of these I gave 2 the same day to Salai, who had lent them to me. 850 published by G. UZIELLI, Ricerche intorno a Leonardo da Vinci, Firenze, 1872, pp. 164, 165, 218 and 219. The date here given by Leonardo does not occur in either of the accounts.]
459:850 : See 'Conto corrente di Leonardo da Vinci con lo Spedale di S. Maria Nuova' [1500 a 1507, 1513--1520