Generally, yes—within the same model run. However, Koken reused number blocks across different decades. A “No. 5” chair with serial 12,000 is different from an “Imperial” with serial 12,000. Always consider the model name first.
❌ All Koken chairs have a serial number. ✅ Fact: Early 1890s chairs and some wartime models (1942–1945) had none. vintage koken barber chair serial number list
: Early models (pre-1900) often feature quarter-sawn oak or walnut with elaborate hand carvings, while 1920s models frequently use porcelain enamel and nickel plating. Generally, yes—within the same model run