1745 Est 50
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---1747 Assistance, Tavistock, Severn; 1748 Greenwich; 1750 Newcastle; 1752 Falmouth

1751 Mod 1745 Est 50 (Allin)
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---1757 Preston

1752 Further Mod 1745 Est 50 (Allin)
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---1758 Chatham

1767 Warwick one-off (Bately)
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1762 Romney one-off (Slade; shorter Warwick)
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1769 Salisbury (Slade; mod Romney)
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---1769 Salisbury; 1774 Centurion

1770 SGN110 PORTLAND (Williams; mod Romney)
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1774 Experiment (Williams; smaller, closer to archaic 1741 Est 50)
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---1774 Experiment; 1785 Medusa

1782 Grampus (Hunt)
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---1782 Grampus, Cato

1782 Trusty one-off (Hunt; mod Grampus)
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1798 Antelope (Williams)
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---1798 Diomede; 1802 Antelope, Grampus

MODELING RECOMMENDATIONS: I'd just use SGN110 Portland for everything back to 1747 Assistance. Experiment, Grampus, Trusty and Antelope I'm not sure.