Is that Roland Rainer?  

Hi. Reiner was Austrian and designed this rocker for Thonet, an Austrian company. I am far from being an expert on the question but I guess it is safe to assume that anything that is not Thonet is not from Reiner. And then is certainly even safer to assume that Reiner did not design anything for Nesto, a Swedish company.

It seems that only this chair is somehow connected to Thonet and Rainer. But I have seen also on such chairs a stamp from Hagafors. But did Thonet really made such rocking chairs? It is not their style in my opinion.