Metropolitan Museum of Art has been make reproductions of this style flask for years. Check the bottom closely for "MMA" either scratched or etched in to the glass. I'm not saying that's definitely what it is, just that in the picture of the base, its looks like it.
we took the flask to a local auctioneer and appraiser and he took a light inside the flask and No MMA he checked the pontil and no MMA Im ready to take offers Anybody interested
Welcome to this place and thanks for the look at your bottle. I'm sorta on the sight challenged side, but your photos seem very grainy. Would it be possible to take some more high definition photos? How many ribs, and what dimensions?