Kevin,

As to the two squares with the letter "K" inside, Dietrich said he has seen them before but couldn't recall right off what he saw them on. He last said he was still digging into it. I owe him a better picture of the stamp using a white grease pencil to show them better for his "history detectives" column. Also, a fellow NE member HBO1 wrote:

"I have a mauser sporter and 12 gauge sxs with the same stamp. I have seen the stamp on half a dozen other guns and believe it is stamp for krupp barrels, although I don't have any direct evidence. All of the guns I have seen with this Krupp stamp are pre-WWI and probably pre-1912. Some of the German afficiados on doublegunshop.com might have a few more details."

That is all I have for now. I will let you know if I hear anything more.

Marcus