Scale 1:24. Plan shows the bridge deck and internal plan view as fitted for the W class submarine W 3 (1915). A Sir W. G. Armstrong Whitworth builder's stamp, dated 8 March 1916 is printed on the drawing. An Admiralty Overseer stamp dated 18 April 1916 and bearing the signature of J. W. Dippy [Admiralty Overseer at Sir W. G. Armstrong Whitworth flourishing 1916] is also printed on the plan.