Nantucket Signals gives the flag throughout the 1831–1843 period.
Catherine operated from Nantucket in 1831–1843 and was then sold to New London. Jered Coffin was the first owner and agent in 1831 and 1835; Christopher Weyer acted as agent in 1839, when ownership is not recorded.
Keep the explicit scope label independent; no alias or company identity is inferred.