INDENTFor a discussion on the significance of the wire-line inner circles on the coins with the lis mark, see, I. D. Brown, "Some notes on the coinage of Elizabeth I with special reference to her hammered silver", B.N.J. XXVIII part III, 1958, pp. 574-77. and "A new mint mark for Elizabeth I." S.N.C. LXXX No. 2 February 1972, pp. 59-60