Interesting. I was thinking along the lines of preventing the 7.63mm from being used in 9mm pistols, which would be ineffective, but not dangerous. I didn't really consider the reverse; as the directive says, firing 9mm in a 7.63mm pistol will result in damage to the pistol.
I also note that this applies only to the Army. IIRC, Mauser pistols were also issued to the Navy. Were any 9mm pistols used by the Navy? If so, the Navy would not be affected by (probably would not even receive) this directive and unless there was an equivalent Navy order, their 9mm pistols on hand might not have been marked. Just one more puzzle.
Jim
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