Halcyon (1933) and Skipjack (1934)
Scale 1:48. Plan shows the structural sections design drawing for the Halcyon class sloop minesweepers Halcyon (1933) and Skipjack (1934). The drawing bears the signature of Arthur W. Johns [Director of Naval Construction 1930-1936]. The title of the plan is "Sloop Minesweeper for 1931 Programme".