The flag appears in the 1840–1850 signal painting.
Levi Starbuck operated from Nantucket in 1833–1850 and was then sold. Nantucket Signals does not give a full vessel history but confirms Levi Starbuck’s involvement in 1833, 1837, 1841 and 1845.
Keep the explicit scope label independent; no alias or company identity is inferred.