Since no complete, official factory list exists publicly (Koken closed in the 1980s and records were lost/destroyed), this content explains and provides a field-guide style list based on known examples.
: Do not confuse the serial number with casting or part numbers like "52CB" or "505KO". These molded-in codes identify specific parts or models, while the serial number is a unique sequential identifier for that specific chair. Identifying the Era by Design Features vintage koken barber chair serial number list
Koken Manufacturing Co. (St. Louis, MO) did not release a master serial number key. The list below is crowd-sourced from restored chairs with known model features. Since no complete, official factory list exists publicly