No, I do not think it is a recent reproduction. Here is a little history I found on him if you are interested. It seems he sold the patent to 46 people, there is not telling how many they sold it to. So I do believe the original design of the Chair has a Dutch origin, it was probably made in the United States. I cannot say who made it since it is not marked. I can value this if you like?
Henry Walter Klein was born June 19, 1919 in Norway. His mother was from Norway and his father was from Hamburg, Germany. He grew up in a very small village and transported himself to school on a pair of skies. At one point he wanted to be a sailor, so in 1937 he went to the Royal Ship in Norway in 1937. He earned several degrees in language and mathematics. He loved mathematics, a great passion that lasted his whole life. He used to read mathematic books at bedtime!
During the war he studied and joined the Norwegian Royal Marine. For two years he worked as a cabinetmaker, and then in 1949, he went to Frederikberg Tekniske Skole in Denmark for three years, where Finn Juhl was head of teaching. In 1952, he could call himself "Boligkonsulent" or an interior consultant--what we might call an interior designer today.
Klein married a Danish woman named Tove and they moved back to his home country of Norway, where he started his own business to do interior design for all the shops in the shopping street. Not surprisingly, they all got wooden teak interior!
Klein then started to develop a new method for manufacturing plastic furniture with an engineer. They cannot sponsor all of it themselves because it is too expensive, so they invite people from all over the world to come and see what they have done. Klein sells the patent to 46 people, including Fritz Hansen and Bramin. The contact with Bramin is so good, that Klein and family moves to Bramming (a small village outside Esbjerg, 20 km from the west coast of Jutland), Denmark in 1960 and he starts to work for Bramin. Bramin becomes not only a wood workshop, but also produces upholstery and this new plastic method. It was quite a big business until the Denmark financial crisis in the 1980s.
Bramin had a permanent exhibition in Bella Centret and Klein was allways there helping building up the fairs--mainly because he did not trust other people to do it properly. He travelled around the world building fairs.
When Bramin closed down in the 1980s he started working from home. He lived in San Francisco, so he designed many couches for the American market. He also had contacts in Italy and Thailand, so he travelled a lot around the world.
He has designed furniture for bedrooms, living rooms, churches and hotels and even for the Prince of Saudi Arabia.