Sand pontil? I don't see any evidence of a pontil scar in the one image of the bottom. The white spots are scattered outside as well as inside the shallow kick-up. That suggests that the spots are air bubbles, not "sand." With a sand pontil, you should be able to feel the grit readily.
Stick your finger into the mouth and feel for a ridge or bump which represents the weld between the lip blob and the neck. No weld in the neck . . . and you can't see a weld when held to the light . . . not an applied lip.
I think it probably will turn out to be an applied lip. I think it dates from 1860-1880. It is a routine cylinder form in a routine (it appears) color. It does have one outstanding feature: It seem to be loaded with seed bubbles. The seed bubbles give the demijohn "character," and collectors seek character. This was a steal at ninety-nine cents.