Specimens of corals from the Devonian limestones of Devonshire in England are hard to come by nowadays - this is one I've just bought and repolished.
It's likely to be a 19th century sample from when the quarries and marble trade were flourishing - many such pieces were sold then as scientific specimens, and many more were used decoratively.
Frechastraea sp. , Givetian/lower Frasnian, Torquay area.
The brass scale bar is 1cm long.