Listed in Mrs. Nevill Jackson's Dictionary of Silhouette (1938) as M.S. BARBER, in all probability, as McKechnie suggests, Jackson mistranscribed Mr. as M.S. The work was a plain black bust-sized profile of a man signed on the rear and inscribed "cut in half a minute" and dated 1824.
As 2022 research discovered, 1824 newspaper advertisements placed by "Mr. C. L. Barber", offering silhouettes cut in "half a minute" - or less, it's safe to support McKechnie's theory that "M.S." Barber was actually "Mr." Charles Lewis Barber (1797-1845) a freehand cutter of some merit who was known to be working between 1822 and 1841.
Revised 26 October 2022 (Brian Wellings)
Source: McKechnie (Author of, British Silhouette Artists and their Work 1760-1860)
Barber, M. S. (McKechnie Section 1)