@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.
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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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