Vom Himmel hoch, da komm ich her

Friedrich Christian Samuel Mohrheim was born the son of Johann Elias Mohrheim (Kantor in Neumark). He enrolled at the Thomasschule in Leipzig in1733 and studied there with Johann Sebastian Bach from 1733 till 1736, and acted as copyist for him during this period. After his study, he was appointed substitute of Johann Balthasar Christian Freißlich in 1750 and Kapellmeister in 1764 at St. Marien in Danzig, where he died. Since Friedrich Christian Samuel Mohrheim not only copied cantata parts but also J.S. Bach's inventions as a Thomaner, Peter Wollny proposed him as Bach's private pupil. Others haven't confirmed that statement.
(source: bach-cantatas.com)

It's not sure if this setting on 'Vom Himmel hoch' is from Mohrheim. The manuscript only reads F.C.S.M. Others mention Scheidemantel, but it's suspected Mohrheim is the composer of this fine example of counterpoint due to these four initials.