Scale 1:48. Plan shows a partial inboard profile [port profile looking from starboard] and fly diagram, as fitted, of the M-class submarine seaplane carrier M2 (1919). The drawing was modified at Chatham yard dated October 1927 and shows corrections in red made at Chatham Yard, dated November 1927. There is a Chatham Yard Constructive Department stamp, dated October 1927, on the left hand side of the plan. A note on the plan states that drawing M. C. D. 2856 contains additonal details of the seaplane hangar.