From British Museum website:
A Ducôte (publisher/printer; British; 1832 - 1840; fl.)
Also known as
Ducôte, A; Du Côte, A; Ducôte & Stephen; Ducôtes, A
Address
70 St. Martins Lane, London
Biography
Lithographic printer, successor to Charles Motte (according to inscription on plate published in 1832). In 1832-33 plates lettered as 'A.Ducôte's Lithography'. Stephen a partner, but apparently only in 1835. From 31 December 1840 plates published at the same address lettered as 'General Lithographic Establishment' (q.v.).