Marie
the Lid is interchangable with other pots, so please don't get too hung up with that. you mentioned that there is a little play side to side. That tells me that it is probably not original to the piece. If it does not fit exact, it is most likely a replacement. Even lids that fit could be a replacement.
I looked through several books, and the piece was called RING NECK STRIPE in the Lechner book on salt shakers. They said it was made by Hobbs, Brockunier & Co. However, in cross-referencing to the Hobbs book by Bredehofts, they only show a SWIRL STRIPE. The Ring Necks were the same, however.
It is an American piece, 1885-1890. There was always a rough finish on the top glass of the rim, due to how they were made. They were mold blown, then snapped off and rough ground.
Value? What you paid for it, or, what it sells for. Prices change all the time, and you might have found it at the local goodwill store. The person who buys it from you might have been looking for 10 years to complete a set. Ya just never know!
Dave
aka: Mr. Vaseline Glass