Cut silhouettes previously attributed to an ‘M S Barber’ appear around 1824. However, it is now generally believed that ‘M S Barber’ is actually Charles Louis Barber, another artist working during the same period who painted a range of people and animals. This is supported by the similar styles of the ‘two’ artists; in particular, an ‘M S’ cut bust of a man is almost identical to a Charles Louis example.
Source: McKechnie (Author of, British Silhouette Artists and their Work 1760-1860)
Barber, M. S. (McKechnie Section 1)