A complex area of plating study with three separate dies (listed), four main stones A, B (Die I), C (Die II), and D (Die III). Additionally, there are various rare stones some partly understood on Die I, between A to B stone progression. Key works are: The Half-Anna Lithographed Stamps of India 1854-1855 Smythies E.A., F.R.P.S.L: pp115: 1928 -- Specialised Catalogue of Early India Lithographs 1854-1855 Dawson L.E., F.R.P.S.L: pp26: 1933. Both are difficult books to find in any format.
The India Study Circle (ISC)
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