Can't quite make out the pattern number, looks like it might be '17336', which would date first production to 1909, the 'm' mark was used from 1907-47. Personally, doubt the liner is original to the piece, the engraving is covered, at a slightly awkward point, by the pierced gallery - with that rim, the glass appears to be perhaps a small bulb-forcing vase, or maybe a jam jar that had a lid resting on the indentation. Steuben can sometimes be dated by the mark, keeping in mind that their marks are also faked - might have a glass expert take a look at it. Size can be helpful in determining what a piece was used for, with that built-in drip plate, suspect it might have been for something a bit messy, there are all sorts of possibilities, a jam jar or syrup jug, with that open base, it may even have been a holder for a commercial container of some sort of sauce - hard to tell, really...
Tiffany Marks
~Cheryl