In the early 19th century, the Danish currency was 1 daler (dollar) = 6 mark. 1 mark = 16 skilling (shillings).
The symbol for a mark was this:
Is this symbol available in Unicode?
As promised in a comment to @Wolff, here is an example from Hans Christian Andersen's book "En digters Bazar" (from 1842). He explains that a Guilder is worth 5 Marks and 8 Shillings: