What type of wood is this?

Hi - moved into a new place - beautiful big piece of wood on worksurface, but no idea what it is. Have sanded and put a little bit of linseed oil on to bring out the colour. Any help appreciated!

My bet is on redwood. Nice slab of it.

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My guess would be black walnut, with the sap wood.

I would agree with Devrin. Sure looks like American Black Walnut.
Your local may help as I suspect it is likely native to your area.

Thank you very much for your advise - I’m in fact in Paris, France…

I still say it looks like Black Walnut. However I have absolutely no knowledge of native wood in Europe. It could very well be something different.
Stay safe over there, with prayers and faith we will get through this.