This would be American or possibly Canadian, definitely not European. Whiskey is likely but could have held all sorts of things. The "Full Pint" in a slug plate is unusual, I don't remember ever seeing one like that before.
I was reading from the book - A Century of Antique Canadian Glass Fruit Jars” by Douglas and Marion Bird, and Charles Corke. Published 1971. - where is stated the use of manganese dioxide is why the jars would turn an amethyst colour after being exposed to sunlight over a long period of time. The use of manganese dioxide was discontinued in 1914.The Gould Act of 1913 required all bottles or labels of bottles to be listed with the volume the bottle would, not just could, hold. Most bottles that tell the volume of the contents date after this Act.