Sorry I never saw it the first time around.
It is not double walled mercury glass as described in the article and which has been in production well into the 20th century, but single glass with an inside mercury coating. This must have been fixed in some way - probably by lacquer - because the coating is susceptible to oxidation, and the object would have been unusable with a straightforward single mercury coating. The lacquer would provide only a limited protection against wear, but silvered glass was never meant to last forever - even the makers considered it cheap & cheerful and they certainly did not produce for posterity. That is why it is now rare where at one time it was overabundant.
The polychrome decoration on the frosted outside is typical for the cottage industry around Haida, and the item itself is probably part of a silvered toilet set. As it is not possible to produce double walled hollow vessels with a narrow neck (think thermos) the perfume (or is it powder puff?) was made in solid glass using the same finish and decoration as the rest of the set: a tablet, a beaker, comb holder etc.
The blanks for much of the silvered glass decorated around Haida were produced by Hugo Wolff.