The serial number on a Koken chair is typically found in two places:
Check the cast iron base plate or the frame's metal casting. Occasionally, you may find "casting numbers" (e.g., vintage koken barber chair serial number list
While Koken changed their system over the decades, later models (1940s–1960s) often used a format where the first one or two digits indicate the year of manufacture. The serial number on a Koken chair is
: Chairs without a hydraulic lift system almost certainly date to before 1892 , when Ernest Koken patented the hydraulic lift. you may find "casting numbers" (e.g.
Simpler mid-century designs, often with less ornate metalwork and more vinyl upholstery. Historical Context Determine Koken Chair Age by Serial Number - Expert Guide