I have associated the D-9 marking (based on labeled examples) with Old Quaker Whiskey, The Golden Wedding brand (whiskey), and Ancient Age whiskey. To be clear, D-9 was registered to the company that sold these three brands (and possible others)
Since this is a generic bottle, it will be hard to go much further in research.
Your bottle has the company mark of Anchor Hocking (manufacturer of the bottle) It very well could have been made in 1944 - I do not say definitely because each manufacturer had its own rules for marking bottles. "44" could have just been a mold number, for example.
Hope this helps.