Scale 1:24. Plan shows the outboard profile, plan and section view, illustrating the docking arrangements, as fitted for the Stickleback class midget submarines Stickleback (1954), Shrimp (1954), Sprat (1955) and Minnow (1955). A Vickers Armstrong builder's stamp dated 22 March 1956 is printed on the drawing. Stickleback was originally named X-51, Shrimp was X-52, Sprat was X-53 and Minnow was X-54.