I have a Moeris watch given to me by my grand father about 7 years ago. It is a Moeris Grands Prix. I don't know much more than that, because I dont know how to open the back of the watch. It is a pocket watch, I don't know where or when he bought it, all I know is that he was from Belfast Northern Ireland. Can anyone please help me in identifying the age of this watch? and how to gain access to the back of it?