unfortunately not..........nothing is ever old simply because of its style.

The Victorians copied everything from the previous two thousand years - neo this and neo that. Sometimes if all else fails it comes down to experience and an indefinable something that is maybe all you have to go on - glass i.d. is far from an exact science, but there are factors that can help, and the wear we discussed is one of those.
Other factors are, for example......................
Can you find the exact piece in a book
Is there wear appropriate for a lengthy period of time
If the glass is clear, what is its colour - bright white or perhaps greyish, or slightly purplish
Does the glass contain striations, bubbles, small stones, or glow slightly greenish grey under u.v. light (indicating manganese decolourant - and obviously only reliable for clear glass)
Is there a pontil scar on the underside.
Does the glass ring well when flicked (indicating lead content)
Does the piece come from a source reliable as to provenance
Not all are relilable, and sometimes genuine peices will defy some of the above. What made you suggest it was c. 1900?
None of this is to say you are wrong, but it would be unreliable to make attributions of age, based solely on style.
I assume this was made as a posy vase, and had it been used some water mark might have remained on the inside. It's also true that with these rustic root style feet, there is often damage to the extremities - those that survive 120 years or more without any scars are probably now in the minority, so have a careful look at the tips of the feet.
I hope it is genuine though.
