Charles Robertson, RWS:\'The ebbing tide, Porlock\' signed with monogram (lower right); further signed and titled \'No. 3/The Ebbing Tide. Porlock/Charles Robertson/Godalming\' (on artist\'s label affixed to the backboard) watercolour 39.7 x 59.5cm (15 5/8 x 23 7/16in).