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It seems likely that Turner copied this subject from a drawing by Edward Dayes (1763–1804) or Thomas Girtin (1775–1802); that artist may in turn have taken it from a sketch by an amateur such as James Moore (1762–1799).1
The verso is D41450 (Turner Bequest CCCLXXIX 3 v).
See Andrew Wilton, ‘The “Monro School” Question: Some Answers’, Turner Studies, vol. 4, no. 2, Winter 1984, p.9.
The sheet has been folded approximately 35 mm from the right-hand edge.