this patterning of imitation cut oval shaped printies (which the pressed glass people in the U.K. called 'hollows' - were a common form of decoration (on pressed glass) in the period 1860 to 1890 - can be seen commonly in Silber & Fleming.
Obviously it was copying the cut circles and ovals which had been around for a long time prior to that.
So, my suggestion for a date would be for somewhere in that period - but always possible it's a later copy - what is the extent of wear?
The combination of a ground/polished flat foot, plus the gilded rim, do point toward a Continental origin.
Notice your thoughts that this might have been fire polished, but could be that if you can see the mould seams then possibly not.
If this were lead glass, might it not ring very well?? what happens when you flick the glass?
None of this is very helpful, but might encourage one of the Continental collectors to comment
