Robert Sayer was active from 1745 and was joined in partnership by John Bennett in 1774. Their early works were derived from maps acquired from the late Thomas Jefferys. One of their most significant productions was the ‘East India Pilot’ which was advertised in 1775 as being ‘in great forwardness for publication’. This chart of the mouth of the River Ganges in India shows the river to Calcutta and beyond. Shirley BL Atlases M.Say-3a no. 58; NMM 417.