This is a 68mm Conical Burr, made by Italmill. This is the burr set we have always used in the Pharos. Specific, measured dimensions: Ø HEX. 68/48- Ø INN. 49/13 - H.25mm - 4 Holes 3mm Key (this means the outer burr is 68mm OD, 48mm ID, the cone burr is 49mm OD with a 13mm mounting hole, and it has 4 holes for mounting, and uses a 3mm key to mount to the shaft)
Various parts sites describe this as also used in the Casadio, Eureka, MACAP M7K, Rossi, and others.