Purely a guess without seeing it in person, but it could be some species of Acacia.
I've used Hawaiian acacia koa, and also Tasmanian Blackwood (acacia melynoxon), in making musical instruments. I'm pretty sure it's not koa - even the simplest grain figure in that tends to be wavier! I've never seen Tasmanian Blackwood so light in colour either.
But it does have a family resemblance, and there are European acacias which might fit. The end grain looks about right, though a view of the pore structure would help.