Teak or walnut?  

If as you said the sideboard is by Knoll, the pieces with sliding doors (like in the image you posted) made in the USA, the case is offered in birch, walnut, maple & black ( ebonized).

There is another Knoll casegood offered in teak & the design is different than the image you provided.

Unless in other countries were you are that Knoll offered these in teak...

It is not walnut. The grain is far too coarse.

I think it is stained oak (red oak). Although it is hard to say from the photos. Based on minimoma

The grain is coarse enough to be teak. Teak and oak have coarse grain. I don

Here is a link to some better photos which I cannot copy for some reason. https://www.decenniadesign.nl/product/Sale/Meubels/Florence-Knoll-dresso...

Looks like Mahogany.

Make sure that the interior drawer is included or maybe it is not just shown in the listing.

It is not. But I don

https://www.1stdibs.com/furniture/storage-case-pieces/credenzas/florence...

This old 1stdibs listing for a German made Knoll International sideboard might be of interest to you Herringbone. I just can't read what is on that label though if there might be a mention of what the wood used for the case.

Thank, minimoma. The label sais, it

I am just making an assumption that the example you are buying does not have a similar label to confirm or answer your question, but at least it is possible that Knoll International in 1961 in that part of the world offered these in teak or other woods(?)

Sorry, I can't be of much help to you, I just can't see anything from a tiny phone screen, for me though, the wood used is not as relevant & likely to acquire this object for its design pedigree & usefulness to me.

Maybe there is such a lable on the back, you are right, I might ask the seller. I totally get your point but for me it makes a difference, if only a small one.I love the design for sure and I need a sideboard just like that for practical reasons, so it

Dude

Dats WALNUT, for real.

teak. 100%

Ha, love the last two comments. But when Leif sais it's teak, it's teak. So I'm looking forward to get it.