hmmm - I remain to be convinced.

I usually associate wide shallow ground pontil depressions with the first quarter of the C19, not small depressions, and tooling marks can be found on much glass up until machine work in the C20. I'd also be very wary of on-line dated attributions unless supported with v.g. provenance - I always remember one seller who added to his sales text - "18th or possibly C19 - you make up your own mind."
If you look at Wilkinson, Fig. 236 - he shows ten salts dating from c. 1730 - 1880, none of which look anything like this one. It's not that I'm saying this can't be the date Nev suggests, but that the features mentioned might be almost anywhere in the C19.
The apparent small amount of wear would seem unusual for a piece of basic utility table ware that was 200 years old, or more.