Daryl
As noted I don't have my reference materials here at the office. I couldn't remember the barrel steel markings on your Optimus (a fabulous piece by the way!), nor can I remember the exact markings of the Krupp barrels on the two Uncle Dan Grades (I'm sure their not mill run Krupp); but thanks for the assist in pointing out that Dan Lefever didn't limit his high-grade gun barrel steels solely to Whitworth and Finest Damascus. Tom