@browkin. The closest I could find was a sofa bed attributed to Behr Mobel, Germany. Have not found one with those spindle side pieces.
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@browkin There are a number of these online attributed to Wilhelm Knoll, Antimott series, like this one.
Thank you folks. Unfortunatelly we could't agree with the seller about the price. Good piece, but also the matrasses are missing and that will take a lot of effort to make some new ones. For such projects I work with a local professional upholsterer and he currently suffers a seems so international increase of foam prices. So, I will let it go.
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