Inscribed by the artist 'U131', lower right. The location shown is Portsmouth Harbour, specifically the mudflats north-west of Fountain Lake and west of Whale Island, at low tide. An R-class battleship is in the right background. The submarine is the same one as in drawing PAF1866 (though in that case with the tide higher, from a slightly different angle and at a different time, since the 'moveable' background detail differs) but it cannot be 'U131' since this was broken up while still incomplete in 1919-20, at Bremen. Technically possible alternatives might be U117 - U126, U139 - U141 and U160 - U167. Of these three groups, U139-U141 have the closest match to the bow shape but they had a second 5.9-inch gun abaft the conning tower and there is no indication of a projecting casing for it. There is also no obvious record of a U-boat being beached or stranded at Portsmouth in 1918-19 prior to being broken up. See also PAF1866 and PAF2211.