My grandfather purchased his first bottle of scotch at Ontario Liquor Control Board sometime in the early 1900's. It is a 26 1/2 oz green square bottle of Ne Plus Ultra by John Dewar and Sons Ltd., Perth, Scotland. It has a gold metal top with Dewar's embossed on it secured by a piece of wire with a small medallion on the end of the wire with the letter "D" in the middle of it. The square bottle is dark green glass with a circle on the bottom of the bottle with the letters as follows:
S 309
N 4
U G B (or 8)
It has sat unopened and still has the box that it came in.
Any idea of its value?