.30-06 dummy with “D” stamped on primer

Hello again all. I am just wondering what the significance of a “D” stamped primer. This is a M1906 dummy, 2nd iteration (6 flutes, 3 holes). Never seen one with a D stamped on primer. Thanks!

D is for dummy (primer)


Lol… ok, I can take a hint. Thanks for the info, now I’ll go wipe that D off my forehead Rene