American whaler Thomas departed to sea in 1817

Of Nantucket, master John Brown, departed on 13 August 1817 to the Pacific Ocean and arrived on 12 January 1820 with 1.000 barrels sperm and 500 barrels whale.

Source
Catalogue of Nantucket Whalers and their voyages from 1815 to 1870. Hussey&Robinson, Nantucket, 1876.