Watch was purchased in Hong Kong in 1970 by my Brother.
I really do not know much about it other than it is an 18k gold case, a 30 jewel movement, a croc strap and I have only been able to find 1 other like it that was said to be a 1960 model. This case has a 1966 date on it.
I have had it repaired but I have never opened it up to see the inside.
The interesting thing is that it has a screw in the back case.