For button manufacture rather than typology see also D. P. White, The Birmingham Button Industry in Post-medieval Archaeology 11 (1977), 67-79 and S. Timmins (ed), _The Birmingham and Midland Hardware District_, 1866. The latter is a marvellous source on mid C19 (mostly little changed from the C18) manufacturing techniques in such trades as buttons, toys, brass stamped wares, die sinking, guns etc Paul Courtney Leicester UK