the only town mark Carolyn, that consist of a crown only, is Sheffield - which is probably the origin of your Silver, although from whence the glass comes is anyone's guess............ but Sheffield isn't that far from some of the C19 glass factories.
The maker's mark is almost certainly Hawkesworth, Eyre & Co., active in the C19, and first in business somewhere around the mid 1830s - the monarch is of course Victoria.
Date letters need a little caution with interpretation, since all letters - both lower and upper case - are used on a rotation basis, with some showing serifs and others sans-serif, so if your upper case N is with serifs then should be 1856/57, and without serifs then 1880/81......... upper case N appears again in the mid 1950s, but that won't be yours............... the town mark and left facing head will be the same for both.
Unfortunately, old silver hallmarks tend to become worn, and not always easy to see whether serifs or not.
my earlier droning on about Sterling was a bit cheeky, and was my way of pointing to your use of Stirling for the standard for silver rather than with the 'e'.
hope of some interest and use.