KM Dienstvorschriften strange Stamp

[AntiqueWW2]

Can please someone tell me what the Stamp in this Dienstvorschrift means? Kommando M606?

[MarcoPennisi]

M606 was a minesweeper that belonged to 2nd Minesweeping Flottilla (and ended in the Royal Navy as a war booty). I’m not proficient in the organization of Kriegsmarine but Kommando M606 may refer either to that ship or the unit HQ.