Zaphrentis Mudstonensis Beautiful Corals

Zaphrentis Mudstonensis (Champernowne 1884)
From the Upper Devonian, Frasnian.
Collected from Mudstone Bay in Devon.
An outstanding beach pebble cut and polished to reveal a cross sections of coral, this really is beautiful!
This was collected some years back and comes to me as part of an old collection I purchased.
The entire specimen including matrix measures 99mm x 49mm.