Black and White
 

I have a bottle of Black and White choice old scotch whisky.
I believe that is from around 1949.
Does anyone know if the markings on the bottom of the bottle are indicators of the age and if so how to read them.
I am trying to figure out how old this bottle is.
Was purchased in Quebec many yrs ago and is in the quart size bottle that is no longer made.

We can have it dated for you, but as always, we need photos! Also, let us know what "markings" are on the bottom of your Black & White.