Yes, 1920g is the weight of the barrels.
The mark behind the Krupp "bullet" is completely unreadable. I tried in vain to photograph it.

On assembling the barrels it was filed over and then covered in part by the soldered on lower ribs. The eagle/M stamp was treated the same, only the M and one wing visible on the left rifle barrel, even less on the right. Of the other stamp only a few scratches are visible.