Two similar (not identical) modernist stools.
These stools are believed to be of Swedish or German origin from around the 1920s-40s.
There are small differences in the structure as seen.
HWM (Henk) Hupkes (Netherlands 1920-2014)
The Dutch architect Henk Hupkes designed very few pieces of furniture. Most of the furniture he designed was for the twenty or so churches he designed throughout his lifetime.
This chair was designed by him in the 1966 for the Verzoeningskerk in Rijswijk. It is made from oregon pine