The flag is assigned to 1837, 1841 and 1851 and appears in the signal painting.
Three Brothers operated from Nantucket in 1833–1865, then was sold to New Bedford. Starbuck owners included an unidentified member, Mathew, Richard and George; agents included Joseph, Mathew and G. & M. Starbuck.
Keep the explicit scope label independent; no alias or company identity is inferred.