Hello Charlie,
I have a DH 20 with 28" Damascus barrels and the barrel flat of the right barrel also has a D with a 4 immediately above it. I believe it must stand for '4 iron crolle'. I know most Grade 2 (G) guns have '3 iron crolle' so it would make sense to me that the higher Grade 3 gun would have a higher grade of Damascus.
my barrel weight is 3 lbs., 2 oz. and at the rear of the flat is a 3 which stands for Grade 3. There is also a C and I don't know the significance of that.
On the flat of the left barrel is only W.K. in an oval which is the stamp of Walter King and an ampersand (&) and I don't know the significance of that either.
I couldn't guess at the 8 on your lug so I'll leave that alone.
Dean
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