I found a pair of these tulip chairs at a friend’s house and said “I’ve featured a similar chair! How interesting”. It turned out to be a remake of UK origin via this post…
A bit of surfing around learned me that Hotel Le Malandre was a Belgian Hotel that designed these chairs or had these chairs designed for itself, but the chairs were manufactured in Japan. Some say in the 30ies and some in the 40ies.
According to some sites I visited the chairs as a pair might be worth around Euro 3,000.00. However I also saw an ad at the Dutch equivalent of e-bay where a series of plaquettes HOTEL-LE-MALANDRE-MODELE-DEPOSE as in the 4rth photo were for sale….haha a forfeit is also possible.