The flag is assigned to the 1841, 1845 and 1851 sailings, and appears in the 1840–1850 signal painting.
Massachusetts operated from Nantucket from 1841, with Robert F. Gardner, Zenas L. Adams and Hiram Baxter [?] among later owners. George C. Gardner and then Zenas L. Adams acted as agents. She was sold to San Francisco in 1861.
Keep the explicit scope label independent; no alias or company identity is inferred.