Old pocket watch, Info would be appreciated...

by H.C DE VRIES
(JOHANNESBURG; SOUTH AFRICA)

This is my grandfather's pocket watch, which he got from his father, and it goes back about 5 generations. I don't know anything about it and would appreciate if some one will let me know some info: what type of watch, where it comes from, how old it is, where it was made and by whom, etc.