Nantucket Signals assigns A793 to 1830, A794 to 1834, both A795 and A792 to 1838, A793 again to 1841 and A79 from 1845. A further source is a painting of whaling signals dated 1840–1850.
American operated from Nantucket from 1828, first under Richard Macey, later Nathan Crosby in 1845 and Robert ? Gardner in 1850, before sale to Edgartown in 1853. Agents included Matthew Crosby, Daniel Jones and Robert F. Gardner. Another reference names Mathew Crosby as owner.
Keep the explicit scope label independent; no alias or company identity is inferred.