thanks to Ivo for taking the time to add these links.

Whilst I agree with comments about the square pedestal foot shape, this was a feature that was copied and drifted on through the C19 at intervals.
It seems that Kosta (Sweden) weren't averse to this foot shape (with gilding too) c. 1880, and I belive that Baccarat were keen on gilding and square shaped feet in parts of the C19.
For the U.K., Regency open salts were ornate, but typified by their thickness, colour of glass, cutting and lack of gilding - have attached pic that believe shows British examples from c. 1820.
Although the Greed Key pattern may have started life around 1800, it was popular on and off through much of the C19 - it was used commonly by makers of some of the opaline and vitrified pieces around the 1870 - 1880 period in what I think is termed the neo-classical decoration.
My personal opinion is that whilst this has some features of the early C19, the plain smooth glass plus its shape, put it much later in that century. For gilding to survive intact to this extent on a piece of utility glass is remarkable, had it been much older.
This example may well be French or Bohemian - what do people think?
Not so sure that I have understood the term 'master salt' - does this mean simply a large salt - might I be correct in thinking it doesn't have the same meaning as, for example, the 'captain' or master glass' when speaking of sweetmeats or syllabub glasses. In that context there were other smaller glasses surrounding the main piece. Or perhaps if you have a master salt, are there are other little salts in attendance.
