I think 27 is the Year.
is [Schwaz] or [Schwarz] a posibility?
probalby it is from North-Germany or Danish
there was a family Schwarz in Teterow an Neubrandenburg
I think it could Neubrandenburg or Teterow
Theodor Gustav Friedrich Schwarz
born ca.1788 in Ivenack
master 1814 -> ca.1820 Teterow
or Otto Emil Carl Schwarz
learning 1803-09 in Neubrandenburg
Master in Teterow
there are some samples with Year as mark from Neubrandenburg