Goldsmiths & Silversmiths Company silver fork dated around mid-late 1700

I found this mixed in with all the other silver I inherited from my grandmother. I did some research and learned it was made in London sometime in the mid to late 1700's by a company called Goldsmiths & Silversmiths. I have not had much luck finding many other pieces by this company, and I am curious to know something about it's value. Does anyone know if something of this age and by this maker is a desirable piece among collectors? It is in very good condition.