I didn't know E C Lyons Co was still around. I've got some of their gravers that I obtained 45+ years ago and I think they were old at that time!.

If I can dig it out, I'll see if I can post a pic of an oct rifle bbl that I florentine finished the top flat with a liner graver.

Here's another place for gravers, Gesswein brand.
Might be a little less expensive. Excellent tools. Lot's to choose from..
http://www.gesswein.com/c-182-gravers-liners-handles.aspx