Ebenzer Coker was apprenticed to Joseph Smith of London in 1728. His first mark was entered in Goldsmiths' Hall in 1738, and he received his freedom in 1740. According to Ambrose Heal, his shop was at The Golden Cup and Rising Sun in Clerkenwell Close or Green. He is cited in a 1773 Parliamentary Report as being at Clerkenwell Close. Bankrupt in 1781, he died in 1783.
Coker registered several marks during his working life, and one of them is very similar to that used by Elias Cachart. It is possible that some of the articles that have been assigned to Cachart's shop were made by Coker.