You would think there is only one Martin Visserbank. That is true, but there are also counterfeit sofas and, for example, a Gijs van der Sluis sofa that is very similar.
Over the years I have seen quite a few passing by and every time the upholstery has been attached differently. Or the frame is different. Or the wood of the backrest is different.
In other words, take a good look at how the old upholstery is attached. And take advantage of that.
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