Goodness knows where I got this piece of wood from, but it was old and dry, and decay had just started to set in, so it was also very light. I didn't have much idea of what it was until I started cutting, when it became obvious that it is a sycamore burr with a bit of spalting as well.
Overall size is 16cm diameter x 12 cm tall. Finished with microcrystaline.
C&C always welcome...Les