I am not a zippo lighter expert. What I have been able to find out via Google sleuthing... There is a single dot on either side of "Zippo" on the bottom of the lighter. This indicates the lighter was manufactured in 1964. 

Condition is pretty good. There are mild circular indentations on the top and bottom of the hinge. The inside of the lighter is not dirty with soot and the current wick has not been lit. This lighter has either been cleaned very well or it was never used?