Noting the current verso (D07124; Turner Bequest CV 89) as one of a batch of ‘loose leaves appear[ing] to belong to this book’, Finberg observed: ‘There appears to be another drawing on back, but it is stuck down tight on a piece of cartridge’. The leaf was subsequently rebound as folio 61 with the hidden side treated as the recto; the drawing appears inverted. The paper is discoloured by adhesive. The Custom House, drawn from the water, appears on the right, indicated largely by shading. See Introduction to the sketchbook for plans in the mid 1820s for a series of London subjects, including the Custom House. As in many drawings in the book, the composition is similar to The Custom House (Vancouver Art Gallery),1 engraved by J.C. Allen, 1827.
Andrew Wilton, The Life and Work of J.M.W. Turner, Fribourg 1979, pp.358–9 no.516.