From this distance, butt looks like birch, maybe maple or even Juglans regia ("European walnut") sapwood. We don't usually see anything resembling wavy grain (fiddleback) in beech. Impossible to say much more without sharp closeups of grain to permit evaluating medullary ray structure.

Here's an example of why color is often a very poor way to identify wood -


Swissicon military stock in J. regia showing light tan sapwood and dark brown heartwood together.