Sauer 1913, 7.65mm, Police Pw.B on the front strap and 1920 on the left frame. Pw.B=Polizeiwehr-Bayern and the 1920 shows that it conformed to the specifications of the 1920 Treaty of Versailles. This gun/serial number is listed in the book History Writ in Steel. The blue rates about 90% and the bore is excellent. The black leather holster has unknown ink stamps inside the lid.