German Silver was an alloy of copper, nickel and zinc , which polishes to look like silver. Isaacn would have been employed to polish whatever his employer manufactured. It does not seem that he was at work, though could have been a home worker, as the 1845 directory lists no 53 as being occupied by a painter and glazier (though orhers may have lived in the house). However , there would have been many places he could have been employed. The nearest would be Ebeneezer Barber , a gilt toy manufacturer (german silver made a good backing for plating with such as gold or silver), at no 46 and James Hardy , general plater, at no 47