St Katharine by the Tower
Very similar iron plaques can be found on mooring bollards around the docks. The design looks early 19th century to us so perhaps this plaque dates from the creation of the docks.
At Balliol Archives we found a very similar image and the text: "Her usual symbols are a wheel and a book, and may also include the more general symbols of the virgin martyr, a crown and a sword." The saint on this plaque has two appropriate extra symbols: the water and the Tower.
Site: William III at St Katharine's Docks (2 memorials)
E1, St Katharine's Lock, Dockmaster's house
Of the three plaques in this picture the left-most is a modern information panel explaining how locks work so it does not qualify for our attentions.
London Details gives some interesting literary references to St Katharine Docks.
