This is a jar. Fill it with whatever and tie off a cloth over its top with a string around the neck. Some time later the ‘canning jar’ came into fashion. It looked similar to this jar, but with a ledge inside its mouth.
Filled to the ledge with boiled fruits and vegetables, the canning jar could then be sealed off with wax. Canning jars did not appear until mid to late 19th century. This jar is a bit earlier guessing by the rolled lip and lime-like coloring. Sometimes there is no way to know for sure where a piece is from, as with this example. It is a simple form that is very common. There are no attached handles or spouts to help determine its origin. Just straight sides and a rolled lip. But, I do know where it is not from, and that list is fairly long, so it’s not a total mystery.
Well, what is it worth? Based on the process I go through, I’d say about $125 or a bit more. Though an attractive early example, it is unmarked, unattributable, and has a bit of damage.