Use is dated 1832–1849, with another example in the 1840–1850 whaling-signal watercolour.
Ganges is dated 1809–1858 by Loughran, but Nantucket Signals begins in 1815. Owners included Gideon Gardner, William H. Gardner, David Joy, Edward H. Barker, Edward Field and William R. Easton. Gideon Gardner and W.H. & J.L. Gardner also acted as agents. She was condemned in 1858.
Keep the explicit scope label independent; no alias or company identity is inferred.