The majority of the Patek and Pearl Queen chemnitzer concertinas were manufactured between 1910 and 1950 under-contract with Otto Schlicht and his associates in Chicago, Illinois. The serial numbers for all of these instruments followed the same sequence.

The Pearl King was manufactured in Germany and some late model Pateks were manufactured in Italy to be imported to the United States. Serial numbers for these instruments did not necessarily follow the same sequence and for some of these instruments, serial numbers were not assigned at all. These instruments are not included in the data base.

Choose a serial number series with an active link from the list below to access a database of serial numbers, manufacture dates and descriptive information for instruments that we have been able to positively identify.