Practically nothing is known about Locke’s background. He cut silhouettes, probably around 1830 and 1840, possibly in both London and Brighton. According to McKechnie, Locke was Samuel Robert Locke, who exhibited at the Royal Academy 1849-54.
Source: McKechnie (Author of, British Silhouette Artists and their Work 1760-1860)
Locke, M. (McKechnie Section 1)Source: Joll (Hon. Secretary of the Silhouette Collectors Club and Editor of the Club's newsletter)
Locke, M. (SCC Newsletter September 2009)