Leonard (and therefore Jeffery) used Krupp Guss-Stahl (ingot steel) and Fluss-Stahl (Fluid steel).
I believe that Guss-stahl is usually found on somewhat lower grades than Fluss-stahl.
However, this one gun looks very, very nice.
I think Leonard/Jeffery used Krupp almost exclusively on his doubles.

I often look at the dolls head fit and the breech face to get an indication of major use & rework on a gun.
This one does not look molested, but better pictures would help indeed...
I would say $20000 to 30000 depending on the details and who is selling it.
475#2 is not very popular compared to 470NE and an expensive round to reload.
WC-