I have a few original National Match rifles and a couple of them have what looks like a little "Dove" cartouche under the proof P. I remember reading a couple of years back that no one really knew what it meant. Now, I have a NIB unissued NM gun (still in the white bag...) that was built in 1967 at Rock Island and sold in 1971. Has anyone considered that the Dove could be exclusive to the Rock island built guns? Anyone else have a known Rock Island gun and if so, does it have the Dove???