I found this bottle earlier this week. Looking for a time period. I read the information on the following two sites. The bottle says JOHN Walker not Johnnie, so I am not sure if that will help with a date. On the bottom it has a J W. It is a squared off bottle. I still need to clean it.
http://en.wikipedia.org/wiki/Johnnie_Walker
JW
http://en.wikipedia.org/wiki/Johnnie_Walker
JW