Must all Fanett chairs have a stamp?  

I do not have the answer for you, but labels fall off, especially paper ones !!

However I did find an interesting site ( link below) which has a FAQ section for Asko furniture.There are a number of queries in relation to the Fanett chairs and some have no labels! The 2nd link ( in response to a query) shows variations of this style of chair with measurements.

http://www.lahdenmuseot.fi/museot/fi/historiallinen-museo

http://www.lahdenmuseot.fi/museot/fi/historiallinen-museo/kokoelmat/kysy...

Regards,

Lexi.

Dear Lexi,

thank you very much for your help. The measures match exactly with my chair. So, now I am pretty confident, that the chairs should be original. I did also some research regarding the marks. In the 60s they seem to be out of paper. So, they could be lost quickly.

Hi, just FYI, Fanett chairs were also produced by

Morning,

Below is an excerpt from the FAQ section in the 1st link above. Helpful in terms of timeline.

"Ilmari Tapiovaara designed a six-ply Fanett chair for the Swedish Edsby mill in the early 1950's. In Finland, Asko made a license for that chair from 1955 to 1966."

Regards,

Lexi.

The most chairs I can find on the internet are from Asko, like the one on the picture with a paper label.