Help me with my koken barber's chair plzz!!

Does anyone know the year of this? Brand name is KOKEN old barber's chair that I'm trying to restore. Just can't figure out the year for the schematics to take it apart an fix it all.

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Can you find a manufactures metal tag with the model # on it? And I have found there are plenty of Koken chair repair videos on Youtube. AND take pictures when you disassemble - easier to put back together that way.

 

I can not find a metal tag anywhere. Nor do I know what year it is an if any parts are missing for it other than the tray. It's said that it reclines but I haven't figured out how yet almost thinking that piece is missing as well if it does recline. An yes taking pictures was the plan but I just need the year so I can find missing pieces

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Here is pictures of Koken chairs - the one that looks most similar to yours from your picture is in the 1920's to 50's

But look through them and decide for yourself, also there are some on Ebay you can have a look at.

http://search.aol.com/aol/image?q=History+of+Koken+barber+chairs&v_t=keyword_rollover