Circa 1880-1900 liquor flask, the number on the bottom is a mold number, each mold has a number when a mold wears out a new one with a different number is used. It is blown in mold instead of completely machine made so it is an older bottle. That style of flask is called a "coffin", popular from the time above I mentioned. Still a nice old bottle, it would look great cleaned up on a shelf.
As you can see there is quite a difference between your bottle and a 1600's bottle, clear glass was not even invented until the 1880's.
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Coinman123,