I think you are right

By looking at my gun versus this H&H, it appears very very similar. Mine has 1+2 express-sights, the H&H hasn`t....Other than that I see no difference. Mine however has the borecaliber marked(.793") which indicate that it was made later. I have looked and looked...I haven`t seen a 10bore regulated up to 10 drams of black like mine. All litterature points the 10 bore as a "8 dramer".
I still like mine....hahahaha