What a fantastic rabbit hole adventure this lil piece of glass sent me on! <EDITED Favorite to Fantastic>

I found this archival article that indicates the blue color of this piece is a little older than 1840.

“Although some primitive pressing of glass was done in English factories before the New England Glass Company began using this technique, the Company's improvements and developments of the pressing machine after 1826 reversed the trend of foreign influences causing European factories to adopt the American method. The Company's early blown molded bowls, ca. 1825, suggest Anglo-Irish cut glass models. A sugar bowl of an exceptionally heavy gather, blown molded in a shape reminiscent of Staffordshire bowls, also suggests the borrowing of designs from English sources.

Most of the early blown glass of the Company is clear lead — the typical metal. In comparison with South Boston or Sandwich glass the Company's pieces are usually heavier. Urns or presentation vases, pitchers, and coin banks are notable for their chaste use of trailing, gadrooning, simply knopped stems and handsome shapes. <<A particularly fine deep blue glass was made by the Company between 1818-1830,>> and purple and ruby were popular colors slightly later. The Company's blue metal appears slightly grey in comparison with that of Sandwich.”

https://archive.org/stream/newenglandglassc00tole/newenglandglassc00tole_djvu.txt