unusual unmarked glass bottle

Brown glass, 6-7" tapered from approx.2 1/2" at bottom, 5/8" in middle, 1" at top. unusual in apearance and shape. It was among several items such as an early blue glass Phillips milk of magnesia bottle and several ball canning jars, also the construction is comparable to other period glass products so I figured the peice was similar in age. My grandfather was a collector of, well, anything that struck his fancy so I have seen many old,unusual, and/or rare peices but I aint never seen nothin like this. 

Good