Originally the Effie M. Morrissey, the schooner Ernestina was designated the official vessel of the Commonwealth of Massachusetts in 1994. It was also named a National Historic Landmark in 1990 by the United States Department of the Interior after its restoration was complete (also in 1994).She is owned by the state of Massachusetts and part of the New Bedford Whaling National Historical Park.

From the National Park Service:

Built in 1894, the schooner ERNESTINA is the oldest surviving Grand Banks fishing schooner; the only surviving 19th century Gloucester-built fishing schooner; one of two remaining examples of the Fredonia-style schooners (the other being LETTIE G. HOWARD, also a National Historic Landmark), the most famous American fishing vessel type; the only offshore example of that type; and one of two sailing Arctic exploration vessels left afloat in the United States (the other being BOWDOIN, also a National Historic Landmark). Today, ERNESTINA regularly sails the New England coast on educational cruises

Source:

Massachusetts State Symbols: Citizen Information Service
Effie M. Morrissey: Wikipedia

Links:

Geological Symbols - 50 States List