Note the D=70/20.6 mark on this smokeless proof gun. The 70 converts to 2.756" (2 3/4") with the 20.6 converting to .811", a proper size for its 12ga chamber at the rear. I do not see any German marks on this one at all & it still carries the nominal chamber size as 12/C in the Diamond.
Perhaps, just another thought on the first gun. German proof laws at the time as I understand them were extremely severe, actually requiring the same proportionate increase in weight of powder charge as was specified for black. Smokeless powder pressures go up with an increased load much faster than does black so many German makers simply refused to submit their guns for Smokeless proof. This law was changed & became more realistic in 1912 when Smokeless proof then became mandatory. Perhaps Pieper did source these barrels from Germany & had to have them proofed before they could be sent to Belgian, But, he waited till they got to Belgium to have them smokeless proofed. A possibility I believe.
