For what it is worth, Mt Washington Peachblow, which was only produced for a couple of years was not lined. If this was in fact Peachblow, Mt Washington would not be a possibility. New England Peachblow was also not lined and was deeper in color, and Webb Peachblow would have had a more yellow, or amber casing at the base and a deeper red at the top. It was lined with white. If it is Peachblow, it would most likely be European. Personally, I would look to English or Bohemian as the origin.
IMHO the artwork strikes me as Bohemian.... Are the little flowers on the branch ends Coralene or enamel? If they are Coralene, I think it would also strongly point to Bohemian, as the process was invented in Germany, and was popular from the mid 1880's to the 1920s.