looks like an older GRS model, pre-QC inserts. can you post a couple shots of the business end, end on? does that black part come out or is it fixedly attached?
JJ, I got this with a first gen graver max. that I purchased off of ebay 10-years ago. I was going thru some of my older equipment and found it again, in a box.
yeah, i've seen those, and the "first gen gravermax" would be about the same era, 30-35 yrs or so ago. a square graver will fit in the end, then it's held with a set screw. assuming it's clean and in good condition it should work fine. fire it up and let us know how it goes..