Thanks for note and info Kevin, I already knew the jug was made in Canada so I posted on the Canada forum, but I did not know anything else about the actual factory and years of manufacturer, etc. so I posted on the Glass forum too, but completely understand the potential complications of having two threads going at one time, and now we are back to the Canada forum so will go forward from here.
Thanks Monika for the quick response; yes, I have a German background, both my grandparents and father immigrated to Canada From Austria. I appreciate the information from your book, it sounds like a very large encyclopedia. Dominion Glass had 6 factories across Canada, and yes, Montreal and Wallaceburg were two of them. I have attached the history of Dominion Glass where it explains the evolution of the Diamond D logo ( or D within a Rhombus).
Not sure what you mean by flask - in English, flask usually means a type of laboratory glass or a small flat rounded glass vessel that you can carry in your pocket. Are you saying this jug in the picture would be considered a type of flask?
In the history of Dominion Glass that I have attached as a file, it mentions during Prohibition, Dominion glass bottles with no markings on the bottom were used to ship whisky from a Saskatchewan still to the United States but then later, they were forced to start using their diamond D logo in order to ship into the states, so yes, this jug could have been used for whiskey at one time, this is one of the things I am trying to find out, what was this jug used for i.e. what liquids were shipped in it and by whom?
What I am really curious about is what the factory code (the elongated number 6 or 9, or fish hook symbol) on the bottom of the bottle refers to - location of factory? Year or month of manufacture? Mold number? Any help or information on this would be appreciated. Erwin