That's about where I got to Paul using his excellent site,I've been trying to find a European historical bottle site to compare date lines for the techniques of bottle making ,unsuccessfully I'm afraid.You would have thought a similar bottle would crop up with a search since it's so distinctive and I think very much in the black glass bracket,but I still have'nt found one.I think it is the real thing because of the wear to the base and the sides,plus a lot of dirt on the inside I still have to remove,not to mention colour and the large trapped air bubbles.I would love to know what it was for,I'm guessing a spirit of some sort maybe whiskey?.