The coins and banknotes on this website identify varieties using the reference codes used by the reference catalogues:
S: Spink; Standard Catalogue of British Coins.
BMC: Peck, CW; English Copper, Tin and Bronze Coins in the British Museum.
F: Freeman, MJ; The Bronze Coinage of Great Britain.
ESC: Seaby/Rayner, subsequently updated by Bull; The English Silver Coinage.
Gouby: Gouby, M; The British Bronze Penny 1860-1901.
D&H: Dalton & Hamer; The Provincial Token Coinage of the 18th Century.
E: Eimer, C; British Commemorative Medals and their Values.
B: Duggleby, V; English Paper Money.
BE: The Banknote Yearbook.
Pick: Krause; Standard Catalogie of World Paper Money.