The flag is recorded in 1843 under agent Robert F. Gardner and may have applied only during his involvement. It also appears in a painting of 1840–1850 signals.
Atlantic operated from Nantucket in 1819–1862, then was sold to New York. The recorded owners include John B. Macey, B. Macy, ? Macey and Robert F. Gardner, with several gaps. Agents successively included Gardner, Macy & Co., John B. Macy, John B. Gardner, B. & P. Gardner, Robert F. Gardner and Zenas L. Adams.
Keep the explicit scope label independent; no alias or company identity is inferred.