I have a violin the only marks i see is the label inside the f hole it reads Ernst Heinrich Roth Markneukirchen 1/S  Copie Francesco  Ruggeri  anno 1922.  The label has bold border  with dashes.  It has a beautiful 1 piece back.  After researching some violins in this year did not have serial numbers or brands.  I dont see any cracks and it is in nice condition for its age. Message me for questions or if you want additional pictures