Scale 1:24. A printed copy of a plan, showing the sections, as fitted of the Type 1 Ham class inshore minesweeper Portisham (1955). The drawing was originally to be used for Frettenham but was reused for Portisham, both of which were Ham class inshore minesweepers. The plan shows the sections at frames 6, 9, 17 and the transom looking forward. The drawing also shows the sections at frames 26 and 36 looking aft. A J. Samuel White builder's stamp dated 23 November 1954 is printed on the plan. This drawing bears the signature of C. M. Jones [Draughtsman at Dorset Lake Shipyard flourishing 1956] dated 14 March 1956. The vessel's hull number 'IMS81' is printed on the drawing.