Cf. the examples from the Rous Lench Collection sold in these Rooms on 30 May 1990, lots 575 - 578 and the taperstick sold in these Rooms on 16 October 1990, lot 34. For a discussion on the attribution of English opaque-white glass see R.J. Charleston, 'Michael Edkins and the Problem of English Enamelled Glass', Transactions of the Society of Glass Technology, 1954