I would be cautious about using it hand held on the lathe as it is. The Sunnen equivalents usually have a torque arm on them that engages with a guide bar on the honing machine to prevent it spinning around if it grabs on to the rotating job. I reckon you would want to have it at least rested against the carriage or a block of wood on the lathe bed etc to prevent it spinning if it grabs.
It may have originally fitted into a honing machine that had a carriage and holder and moved along the job a bit like a travelling steady on a lathe. Seems to be a few of the pictured unit for sale on the net, but no detail of how they were originally used. As Micromatic were a US manufacturer of honing machines, I would guess it was for use in one of those rather for general use in a lathe. But possibly not.
Edited By Hopper on 10/06/2022 09:33:55