A Royal Warrant granting Alfred Tylor and Joseph John Tylor the right to introduce their Improvements in arrangements and apparatus for use in submarine operating, the copper-plate printed script with hand written details numbered 730 and dated 1876, complete with wax seal -- 6.5in. (16.5cm.) dia, contained with in a tin and attached to the document by cord -- 20½ x 30in. (52 x 76cm.)