Scale 1:48. Plan shows the inboard profile, and plan view of the bridge ,superstructure and outer hull, as fitted of the L50 class submarine L52 (1918). A Sir W. G. Armstrong Whitworth builder's stamp, dated 23 March 1921 is printed on the drawing. A faded Admiralty Overseer stamp, dated 1 January 1922 bearing the signature of T. H. Bentley is also printed on the plan.